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Old 05-02-2009, 05:15 PM   #61
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Your problem with 6.1 on RF ch 21 may be due to this type of antenna generally being weak in the lower UHF frequencies.

http://www.hdtvprimer.com/ANTENNAS/comparing.html

On the first chart of this URL nearly all the UHF antennas are weak on the low end, except the Winegard PR-8800, now called the HD8800.
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Old 05-15-2009, 06:17 AM   #62
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I just built one of these using 10 gauge copper wire and I solder the the V pieces before putting them under the screws and washers- I used double washers with each screw, placing the wire between the washers and used 1/2" sch 40 pvc tubbing using 90 degree pvc and tee fittings to make the frame. Spray painted it black the frame only. This way its weather proof and looks better than a piece of would hanging on the house. Installed it outside and I pick up more channel then with the original 100.00 antenna I bought. Would like to make another and face it in the other direction to pick up channels from direction that I never even knew where there. But fade out every now and then. I live somewhere between 40 and 50 air mile from my normal stations. These would come in fine only on clear days. With this antenna I made it does not matter if its raining or not. Great reception!!!!! 75% thur 100%
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Old 05-18-2009, 09:15 AM   #63
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Do you have any pictures and how is the performance on your signal strenth. Did you go by the original specs?
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Old 07-03-2009, 11:18 AM   #64
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Default Multiple tv's

Has anyone tried several tv's on one antenna? jd
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Old 07-03-2009, 11:30 AM   #65
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Quote:
Originally Posted by danek View Post
Has anyone tried several tv's on one antenna? jd
Welcome to the forum.

Yes it works fine. You use a splitter or distribution amp. Available at Walmart even.
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Old 07-07-2009, 06:21 AM   #66
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Default Doh! It works!

I used the seven inch, four bay whisker design and I have received signals from 29 channels from a distance of around 37 miles to around 58 miles.

My house sits in a very flat location (Venice, FL) so I don't think I have any line of sight issues.

The signal strengths I have received range from 15 to 37, with 15 marginal unless it is really steady, which it appears to be.

I have two directions to point my antenna, which will be used indoors on a single set, although I do have an outside pole with multiple drops for four different spots in the house. If I point it pretty much due north I receive signals from Sarasota and the Tampa Bay region. If I point it around 120 degrees I get the Fort Myers towers. I think there also is a Lakeland station in the mix which is slightly east of due north, but not important to have.

If I have an issue, it is that I get all the major channels except a CBS affiliate. I really don't need the three ABC affiliates I get, but I am pleased to have them. The missing CBS affiliate is WTSP from St. Petersburg or WINK from Fort Myers. These affiliates are located at 10.n and 11.n and the reason they are not received is the lowest tuner position received is 16.n.

The question I have is do I need to throw an old school antenna on the pole outside to get either of these channels and use an A/B box? Or would a slightly bigger design with longer whiskers produce one of these channels?

Thanks for a great forum!
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Old 07-07-2009, 06:37 AM   #67
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Dan34293, if I'm not mistaken, that's a pair of Dynaco A25 speakers you're using.
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Old 07-07-2009, 07:03 AM   #68
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Default Yes they are,

Quote:
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Dan34293, if I'm not mistaken, that's a pair of Dynaco A25 speakers you're using.
but they are "inactive".

Thanks for mentioning it.

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Old 07-07-2009, 03:45 PM   #69
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Default Multiple TV's Q

I made a pretty good example of the antenna. I discovered a station I did not have... But, my C 6 (upstate NY) requires me to hold the cable, or jamb the cable under the tv, which I did. All stations now work fine.

Does this mean I need some sort of additional ground? How and where?

Thanks, jd
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Old 07-07-2009, 08:17 PM   #70
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Sometimes it is important to take a step back to move forward. Tonight I cut my reflector off to see what kind of affect it played wrt signal strength. Signal strength was cut in half and rendered the channel unviewable.

I also have a 2' X 4' piece of foam backed insulation board. I tried holding that up behind my collector to see if I could approach or exceed the signal strength of my reflector and it fell short.

I will need to play with this some more and experiment with more reflectors.
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Old 07-07-2009, 09:17 PM   #71
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Another factor is the distance from the whiskers to the reflector, a CM4228 has 5 inches from bow-ties to the reflector.

If it is too close, it may actually reduce signal by having the reflection cancel out some of the direct signal. you want to find the distance where the reflected signal builds on the incident signal.

Unfortunately, that distance varies with the frequency of the channel.
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Seeking colinear harmonics!
Programming: Dish AT120
Displays: Sony VPH-D50Q FPCRT - 7 ft on the wall; Hitachi 57R59 RPCRT; Panasonic 42" Plasma; 26" Sanyo LCD
Receivers: DishNetwork Hopper w/Sling; DishNetwork Hopper 2000;3 - DishNetwork Joeys; 2 - TiVo HD Series 3; 2 - TiVo Series 2's; Accurian 6000; Samsung SIR-T351; Panasonic ShowStopper 2000; ATI HDTV Wonder
Dish 1000.2 on 110,119,129; Dish 500 on 61.5 - where I now get my HD Locals
Sony 80GB PS3;Sony 500GB PS3 Slim; Toshiba HD-DVD
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Old 07-28-2009, 08:46 AM   #72
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Hey Guys I finally built the antenna for me. I contacted my CBS channel and asked them to tell me why there signal was the weakest and told them our problem and they stated that they were replacing there tower and could take a few weeks. That was not good enough for me so I built a 34” one bay DB4 antenna with 10” V’s and 1 ľ” phasing lines and solider all joints and I do not use a reflector because I need a multi directional antenna. When I tried the temp. model all my channels went from 30 to 50% to 90 to 100%. So I built one out of solid materials. My antenna sits 34’ off the ground and we do have several trees to work around but I will confess that this antenna works in my area and I have tried the DB8 type with only 7” V’s and it worked good but not like this model. So before you give up keep trying different ways.
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Old 10-04-2009, 08:59 AM   #73
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Default Db4

Could anyone give me specs. on building a DB4 ? If it is 10" V's how far apart 5 3/4 and how wide at the end of the V 3" or do both of these change thanks Jeff
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Old 10-04-2009, 10:16 AM   #74
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Jeff,

Drawings for the mclapp 4-bay antenna can be found here: http://www.frontiernet.net/~mclapp/A.../diagrams.html

Note, mclapp recommends 5-1/2 inch spread at the end of the whiskers. He has also stated that this is one of the least critical measurements with the antenna. Variations in spread have small to no effect on received signal strength. The above link is for the 9.5"whisker 9 inch bay spacing design. It is tuned for little higher gain on the higher frequency channels. The 9.5x9 has higher gain for VHF channels 11 through 13 than the 10x9.5 that I use. The 10x9.5 is tuned a bit lower and gives higher VHF gain on channels 7 through 9. If you don't need VHF reception, build the 9.5x9 version, it's a bit smaller.

You can see his performance charts here:
http://www.frontiernet.net/~mclapp/Antennas/plots/
http://www.frontiernet.net/~mclapp/A...mpare 4221.gif
http://www.frontiernet.net/~mclapp/A...t%20VHF-HI.gif

HTH, Let me know if you have any other questions.

Best,

Rick

Last edited by IDRick; 10-04-2009 at 10:24 AM.
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Old 10-04-2009, 09:15 PM   #75
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Made two 4 bays so far.

My first one uses
paneling, 2X4, foil and coat hangers.

Second one uses
Cardboard, 2X4 - 5 pieces, foil and like 20 gage wire
Made for light weight.

Need to test both to compare.
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