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Nashville OTA antenna

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Old 01-08-2018, 12:18 PM   #1
A couch and an HDTV to go please.
 

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Default Nashville OTA antenna

Howdy,
Been having some trouble with OTA reception in Nashville, just south of the zoo. Currently using a Mohu Leaf 50, amplified, in the attic. Get decent reception except for cbs, which is lo-VHF and about 100 degrees away from the majority of the towers. I have read that the leaf is poor for lo-VHF, so are there particular antennas I should try or do I need a splitter and rabbit ears? Any advice would be appreciated.
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Old 01-08-2018, 12:31 PM   #2
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I would post my TVfool report.
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Old 01-08-2018, 12:33 PM   #3
A couch and an HDTV to go please.
 

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But I cannot post any links.
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Old 01-08-2018, 12:34 PM   #4
A couch and an HDTV to go please.
 

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Until I have enough posts.
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Old 01-08-2018, 12:36 PM   #5
A couch and an HDTV to go please.
 

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Until I have 5 posts.
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Old 01-08-2018, 12:37 PM   #6
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And here we go:
http://www.tvfool.com/?option=com_wr...60eda1e697b171

Channel 4 (real 10) also has static problems.
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Old 01-09-2018, 02:31 PM   #7
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Welcome, SpookySpaceKoo

Thanks for the TVFool report. They are currently using a defective database, datecode 201711011344, so there are often errors in reports. This is from your report:



This is a report from rabbitears.info:



You can see that there are two WTVF CBS transmitters, one on VHF-Low channel 5, and one on UHF real channel 25. It is the real channel that determines what antenna is needed. If you can get CBS on real channel 25, you will not need a big VHF-Low antenna.

VHF-Low, real channels 2-6
VHF-High, real channels 7-13
UHF, real channels 14-51

The virtual channel number (like 5.1) is a holdover from the analog TV days to maintain the identity of the station, and is what the TV displays.

http://www.rabbitears.info/market.ph...&callsign=wtvf

And for comparison, here is a report from the FCC DTV map site. It shows the UHF WTVF, but not the VHF-Low transmitter:

Attached Images
File Type: jpg SpookySpaceKooHDFreportTVF.JPG (130.4 KB, 48 views)
File Type: jpg SpookySpaceKooHDFreportRE.JPG (169.7 KB, 48 views)
File Type: jpg SpookySpaceKooHDFreportFCC.JPG (132.3 KB, 41 views)
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Last edited by rabbit73; 01-09-2018 at 06:02 PM..
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Old 01-09-2018, 04:29 PM   #8
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Hi rabbit 73 what do you suggest the 8200u
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Old 01-09-2018, 05:35 PM   #9
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If he can get CBS on real channel 25, he doesn't need the BIG HD8200U. Pretty big for an attic, too.

If he does need real channel 5, a simple folded dipole might be sufficient.
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Old 01-09-2018, 05:37 PM   #10
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Thanks for the info rabbit73. If I understand you correctly, since I am not getting a strong signal from 5.1(25), I should look to upgrade to a directional antenna. Since most of the channels are at 348 and PBS and ABC are at around 248, should I get something like this (https://www.walmart.com/ip/Ge-33692-...tenna/52170370) and point it to ~300?
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Old 01-09-2018, 05:57 PM   #11
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Your TVfool report looks very good.

Signals are all fairly strong, I would get a better antenna, but a monster is not necessary.

Maybe like this RCA from Wal-Mart:

https://www.walmart.com/ip/RCA-Subur...-Mast/10828410

Or this ChannelMaster:

https://www.channelmaster.com/STEALT.../cm-3010hd.htm
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Old 01-09-2018, 06:16 PM   #12
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Any suggestions on where I should be pointing it?
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Old 01-09-2018, 07:24 PM   #13
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Quote:
Originally Posted by SpookySpaceKoo View Post
Thanks for the info rabbit73. If I understand you correctly, since I am not getting a strong signal from 5.1(25), I should look to upgrade to a directional antenna. Since most of the channels are at 348 and PBS and ABC are at around 248, should I get something like this (https://www.walmart.com/ip/Ge-33692-...tenna/52170370) and point it to ~300?
I like your idea of pointing it at about 300, but I think you need an antenna with a wider beamwidth.

But before you try another antenna, I want to ask you if you have tried the Mohu without the amp that comes with it. That amp overloads easily and your signals are very strong. The strength of the signals in your report assumes your antenna is outside and in the clear, but it is in the attic and there might be trees in the signal path. So, it is difficult to predict the actual signal strength from the antenna.

I like the GE antenna, and I use its twin the GE34792 inside on the ground floor. I think you might want to try it to see how much better it is than the MOHU, but its beamwidth might not be wide enough for the azimuth spread. I used this video to help me with the assembly

https://www.youtube.com/watch?v=1qYucg3JXzA

First try it without a preamp. If the signals are to weak add a CM 3410 which resists overload.

My first choice would be the Antennas Direct C2V that has a 70 degree beamwidth for the UHF section and a dipole for VHF-High. It is harder to find because the Antennas Direct ClearStream2MAX is being sold in stores now. If you get the CS2MAX, order the accessory reflector to give more UHF gain and reject multipath reflections in the attic.
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Last edited by rabbit73; 01-09-2018 at 07:29 PM..
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Old 01-09-2018, 08:12 PM   #14
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To give you an idea of signal strength, and how much is too much, you can use this Noise Margin chart for comparison. WKRN has a listed NM of 73.5 dB on the TVFool report without even adding any antenna or preamp gain.



Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html

So you can see why I am concerned about overload.

WTVF CBS will be moving to channel 36 because of UHF Repack; you will need to rescan to find it after it moves. WTVF on real channel 5 will stay there.
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Last edited by rabbit73; 01-09-2018 at 08:26 PM..
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Old 01-09-2018, 11:40 PM   #15
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So, I checked out signal with and without the amp, using my TIVO to test for strength. According to the TIVO, signal strength for channel 5 (25) was 60 with the amp and 60 without the amp. For channel 4, it was pretty much the same, 66 without and 62 with. I don't know if that TIVO signal strength correlates to anything useful, but it is what I have at hand.
The wife tells me that channel 17 (real 15) also has problems. For a counter example, channel 2 (real 27) is very solid, which I would guess would argue against overload.
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