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Old 07-02-2018, 05:17 PM   #1
My plasma is High Def.
 

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Good evening everyone. New to the site, and this is my first which is probably painfully apparent. I'm in the process of cancelling my cable bill (Xfinity) since I'm tired of paying $165 a month for something I rarely watch. I will be keeping my internet with them seeing as I need it for work and Amazon Prime, Netflix....
I thought I did my research fairly well (OCD), and finally broke down and bought an antenna from Amazon (ANTOP AT-400BV Flat-panel Smartpass Amplified Outdoor/Indoor HDTV Antenna) and mounted it on the west side of my house. (All primary stations are either NNW or SSW). Paid $142 for it. Reason I bought this particular one is because I live in an old CBS house and have a metal roof; neither of which are conducive for good reception on an indoor antenna. My ZIP is 33410 (Palm Beach Gardens, FL) if anyone cares to see what my local channels should be. I checked on both the DTV reception (FCC.GOV) site as well as the TV Fool site. I should be getting pretty dang good reception from all the local stations, and actually picked up 43 channels when I did the tuner search.
Primary issue I'm having, is I'm getting ABC and FOX with no issues ( as well as a multitude of lesser channels), but both NBC and CBS I only get a garbled audio and no image. It even gives intermittant weak signal messages on the TV for these station. On the FCC page, it indicates both NBC and CBS are Hi-V band stations. The antenna I bought CLAIMS it picks these up Hi-V (I think...thought it said it did but now I can't find it). Currently, the antenna is mounted just under the gable, and I'm trying to determine which direction to go (I did read quite a few previous posts in an attempt to get an answer, but was still a bit confused);
A). Do I just need to raise the antenna up higher on one of those pole mounts, or.....
B). Is the antenna I picked actually just garbage and I need to return it for a better model, or....
C). Do I need to get a separate antenna just for the Hi_V stations?
I'd prefer to have as few antennas sticking up as possible, but will do what ever is needed. TIA, and I perfectly understand if I need to be hazed considering I'm a noob to all this.

Dave
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Old 07-02-2018, 06:28 PM   #2
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Not knowing how much overhang you haveon the gable, a guess might be that the roof is blocking signal from the 2 VHF-Hi stations because they are only 10 degrees west of due south.

Can you mount the antenna a little lower on the house to clear the gable or maybe on then end of the gable itself?
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Old 07-03-2018, 05:01 AM   #3
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Check with Comcast. Most "Internet only" subscribers either get locals for free and/or can get locals AND a lower subscription fee. If they encrypt locals, they can provide an HD capable DTA at no charge. YMMV
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Old 07-03-2018, 05:06 AM   #4
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Jim (I'm guessing that's your name from the screen profile), for the response. I can't mount the antenna much lower because; A). it's only a single story house and the roof pitch is fairly shallow (built in 1964). B). Got a neighbors house 12 feet away to the west of me and an abundance of trees and palms to the north and south between us. The antenna i bought can be wall mounted or mounted on a pole. I would have mounted it further out on a pole if it came with aa pole, but..... I'm looking at some on amazon right now. The soffit on my gable overhangs 18", so I am trying to find a longish one (18-20") to get it out from under the roof overhang and hopefully obstructions. I thought about trying to mount it to the fascia board on the roof, but the metal overhang from the roof material covers about 2/3 of it up, and I don't want to drill into that and possible create a place for water to weep in.
Do you know much about the antenna I bought? Good or bad? I'd be happy to return it and get a different one if it is most likely not going to fit my needs.
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Old 07-03-2018, 08:11 AM   #5
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Quote:
Originally Posted by DynomiteDave View Post
Jim (I'm guessing that's your name from the screen profile), for the response. I can't mount the antenna much lower because; A). it's only a single story house and the roof pitch is fairly shallow (built in 1964). B). Got a neighbors house 12 feet away to the west of me and an abundance of trees and palms to the north and south between us. The antenna i bought can be wall mounted or mounted on a pole. I would have mounted it further out on a pole if it came with aa pole, but..... I'm looking at some on amazon right now. The soffit on my gable overhangs 18", so I am trying to find a longish one (18-20") to get it out from under the roof overhang and hopefully obstructions. I thought about trying to mount it to the fascia board on the roof, but the metal overhang from the roof material covers about 2/3 of it up, and I don't want to drill into that and possible create a place for water to weep in.
Do you know much about the antenna I bought? Good or bad? I'd be happy to return it and get a different one if it is most likely not going to fit my needs.
Here is a suggestion. Get a telescoping pole to mount your antenna on so you can move it around with the antenna mounted at least 3 feet above the roof. Try several different locations without attaching the antenna to the house. May require a friend to hold the pole while you check the reception. I had a friend who use one of those basketball mounts to attach a pole to for testing. Once the optimum location and height is found, then you can decide how best to mount it. Even if you don't end up using this antenna, the pole can be used for whatever antenna you end up with.

With your roof construction and the eves situation, your best bet may be to run a pole from ground level attaching it in the ground and the edge of the eve once you find the best location.

https://smile.amazon.com/CHANNEL-MAS...g+antenna+mast

From what I read on that antenna it does have VHF high in the specs, but less gain than the UHF. Amazon ad says it has a 30 day window to return, so by then you should have an idea if it will work for you. Most omni directional antennas only work when you are very close to the station antennas.

Also you can not use the miles advertised as they are mostly bogus. There is no industry standard for this specification and miles are just a marketing ploy term.
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Old 07-03-2018, 08:36 AM   #6
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One more thing that jumps out for me is according to the tvfool report for zip 33410: http://www.tvfool.com/?option=com_wr...90383236229ff3

It shows NBC on real channel 12 and CBS on real channel 13. I hope that is just wrong data because with them both from the same location like it shows, there will be a lot of co-channel interference which would explain why you have trouble with those channels. I'm surprised to see that as usually there is more separation than that.
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Old 07-03-2018, 08:56 PM   #7
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Hello, Dave; welcome to the forum

Your zip code is a fairly big area



this is a map of your area showing the signal lines



In order for us to give you good advice, please post a TVFool report using your exact address or coordinates (which will not show in the report). You can do it here:

http://www.tvfool.com/index.php?opti...pper&Itemid=29

You will not be able to post an active link until you have at least 5 posts, so just give us the last part like this:

?option=com_wrapper&Itemid=29&q=id%3de6a46686a80dec

Don't let it bother you if there is a space between the last two characters in the short link.
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Old 07-03-2018, 09:01 PM   #8
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The database used by TVFool has some errors, so your report might not be exactly correct. This is an image of a zip code report for your area:



a report from rabbitears.info, based on the zip code location, shows the missing WFLX Fox:



Most of your important channels come from the SSW, but ABC comes from the NNW; this creates a problem.

NBC and CBS are VHF-High, and are weaker than the rest of your desired channels.

Your antenna does cover VHF-High, but it only has a rod dipole that doesn't have much gain. The description for your antenna does state VHF-High coverage, but the amp doesn't compensate for the low gain of the dipole for weak signals.
https://www.amazon.com/ANTOP-AT-400B.../dp/B01NBTMGJ4

Have you tried both positions of the gain switch?

The suggestion by rbinck to find a hot spot for the signals on your property before permanent mounting is very good advice. I'm worried about the trees, they can block TV signals.

You might need an antenna with more gain for VHF-High, but test with what you have now.
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Last edited by rabbit73; 07-03-2018 at 09:46 PM..
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Old 07-03-2018, 10:01 PM   #9
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Quote:
Originally Posted by rbinck View Post
One more thing that jumps out for me is according to the tvfool report for zip 33410: http://www.tvfool.com/?option=com_wr...90383236229ff3

It shows NBC on real channel 12 and CBS on real channel 13. I hope that is just wrong data because with them both from the same location like it shows, there will be a lot of co-channel interference which would explain why you have trouble with those channels. I'm surprised to see that as usually there is more separation than that.
I don't see a co-channel problem; co-channel means same channel. NBC and CBS are adjacent channels, meaning next to each other.

Dave already has enough problems with weak VHF signals, UHF signals in two directions, buildings in the signal path, trees, and his antenna should be grounded.

If the antenna is outside, the coax shield should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety and to reject interference. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge which will tend to discourage a strike, but the system will not survive a direct strike.

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Old 07-04-2018, 06:36 AM   #10
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Quote:
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I don't see a co-channel problem; co-channel means same channel. NBC and CBS are adjacent channels, meaning next to each other.
My bad. I meant adjacent channel interference.
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Old 07-04-2018, 09:32 AM   #11
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My bad. I meant adjacent channel interference.
Understood. I learned the difference between the two when I stuck my foot in my mouth and got corrected.

Adjacent channel interference isn't usually a problem unless there is a great difference in signal strength between the two channels. There is often a highlighted red "a" before the callsign in a TVFool report as an adjacent channel warning.

According to the ATSC guidelines, you should be able to receive the weaker channel if the signal strength of the stronger channel is less than 33 dB more than the weaker channel.

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Last edited by rabbit73; 07-04-2018 at 09:36 AM..
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Old 07-04-2018, 01:22 PM   #12
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Old 07-04-2018, 01:24 PM   #13
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Old 07-04-2018, 01:25 PM   #14
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Old 07-04-2018, 01:26 PM   #15
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