The Official AVS Antenna and Related Hardware Topic! - Page 543 - AVS Forum
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post #16261 of 16271 Old 07-28-2014, 09:23 AM
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Current setup is 4 TV's. On one of them (the one in question) I would like to have two DVR's (CM DVR+ and DTV Pal DVR - each with two tuners.
Thanks for your response.
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post #16262 of 16271 Old 08-10-2014, 12:59 PM
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Per HDTVPrimer website model, Silver Sensor has Raw Gain ~ 7 dBi across entire UHF Band....which is more than a 2-Bay Bowtie (e.g. Mohu Leaf, WallTenna) and much more than a simple Loop used with most Rabbit-Ear Antennas. If you look at the detailed Azimuthal Pattern chart for the Silver Sensor, you'll also see that it has a very broad Beamwidth with significant suppression of Multipath coming in from the rear:
http://www.hdtvprimer.com/antennas/comparing.html

For more Gain, you're gonna need a bigger Boat....err Antenna.....
However, a higher Gain Antenna also means a narrower Beamwidth, which means it will have to be more carefully pointed toward signal sources. Perhaps located in the top of a convenient closet....

FF4, Free-Form 4-Bay Bowtie provides UHF Raw Gain = 9.7 to 12.6 dBi in a simple DIY project that can be as easy as AWG10 wire or even metallic or aluminized tape on Cardboard (perhaps hidden behind a Picture if the direction to stations permits). It also provides Hi-VHF Raw Gain = 3.5 dBi, with only a slightly higher than desirable SWR:
http://imageevent.com/holl_ands/mult...aybowtienorefl

If you have room for it, adding a Reflector to the FF4 can increase Gain by about 3 dB, with much more suppression of Multipath from the rear. The only Reflector I've modeled for the FF4 is a HUGE Double Angled Reflector:
http://imageevent.com/holl_ands/mult...dblanglreflopt

For a "flatter" FF4, you might want to consider using a 36"Hx36"W FLAT Reflector 5.5-inches away from the Bowties, made from either a piece of Cardboard covered in Aluminum Foil or METAL "Mesh Hardware Cloth" which should be available in your local hardware store, such as:
http://www.midlandhardware.com/25695...A#.U-fGdGOc6jM

UHF Quad Trapezoid Loop with 15 Reflector Rods provides UHF Raw Gain = 10.1 to 11.8. [Without RR's Gain isn't much higher than Silver Sensor.] This SIMPLE DIY project is useful when the station directions make it difficult to mount the antenna on a wall, since it has a very wide Beamwidth of 60+ degrees all across the UHF Band. It also provide Hi-VHF Raw Gain ~ 6 dBi, but with excessive SWR that may *or may not) limit it's usefulness to strong local signals. Instead of 15 Reflector Rods (RR), you could use the same overall size Alum. Foil or Metal Mesh Hardware Cloth:
http://imageevent.com/holl_ands/loop...dtrapezoidloop


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Last edited by holl_ands; 08-10-2014 at 01:06 PM.
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post #16263 of 16271 Old 08-10-2014, 04:38 PM
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Holl, for the FF4 feed point, how does the balun attach. Should the balun wires be spread diagonally to attach, or should the balun wires make a sharp right angle?

Would it be possible to maximize the peak gain for ch 35?
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post #16264 of 16271 Old 08-10-2014, 04:39 PM
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Maintaining no reflector, can a narod be added to enhance the gain and lower the swr for high vhf?

Last edited by Don_H; 08-10-2014 at 04:46 PM.
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post #16265 of 16271 Old 08-10-2014, 05:19 PM
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Quote:
Originally Posted by Don_H View Post
Holl, for the FF4 feed point, how does the balun attach. Should the balun wires be spread diagonally to attach, or should the balun wires make a sharp right angle?

Would it be possible to maximize the peak gain for ch 35?
Doesn't really matter how you route the Balun Wires...

The max (or any other frequency point) for ANY Antenna can be Rescaled to another Frequency by multiplying ALL Dimensions by the Rescale Factor = Current Frequency / New Frequency.
Hence moving the Max Gain to a LOWER Frequency requires INCREASING all dimensions....and vice versa. When making drastic frequency changes, the Wire Size should also be changed according to the Rescale Factor.....but for changes within the same TV Band, it's okay to use the same Wire Size.


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post #16266 of 16271 Old 08-10-2014, 08:19 PM
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Ok, ty much for the info
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post #16267 of 16271 Old 09-13-2014, 07:28 AM
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I currently have been using a dual vertically stacked 4228 and I am looking to replace it with another antenna. I see the replacement for it is the 4228HD. I am not sure that that antenna can be stacked.
I was wondering what the best options would be
Choice 1 Stack a 4228HD
Choice 2 CM-3020
Choice 3 CM- 5020
Most of my viewing is on UHF, very little on VHF only a couple
I am also concerned with the weight of a stacked 4228HD
Thank You

Tom
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post #16268 of 16271 Old 09-13-2014, 05:21 PM
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Please Include a Link to your TVFool Report

Hi,

Zip 43952 has stations in several directions.

Please reply with your TVFool report and what stations / Networks you are interested in.

And the direction your current antenna is pointed. Do you have a rotor? Height of antenna would also be useful.

Are you using an amplifier?

TVFool
http://www.tvfool.com/?option=com_wrapper&Itemid=29

Pasting an image is not the same as a link. Here is mine.

Nani's ZIP Code
http://www.tvfool.com/?option=com_wr...d2434989f75b87

The experts here will then be able to help you better.

Be sure and enter your exact address in to TVFool, I see lots of terrain differences in that zip code.

Your exact address is hidden by TVFool.

SHF

Last edited by SFischer1; 09-13-2014 at 07:28 PM.
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post #16269 of 16271 Old 09-15-2014, 06:43 PM
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Quote:
Originally Posted by SFischer1 View Post
Hi,

Zip 43952 has stations in several directions.

Please reply with your TVFool report and what stations / Networks you are interested in.

And the direction your current antenna is pointed. Do you have a rotor? Height of antenna would also be useful.

Are you using an amplifier?

TVFool
http://www.tvfool.com/?option=com_wrapper&Itemid=29

Pasting an image is not the same as a link. Here is mine.

Nani's ZIP Code
http://www.tvfool.com/?option=com_wr...d2434989f75b87

The experts here will then be able to help you better.

Be sure and enter your exact address in to TVFool, I see lots of terrain differences in that zip code.

Your exact address is hidden by TVFool.

SHF
http://www.tvfool.com/?option=com_wr...d243367f6bb01b
40 foot tower and a preamp

Thank You

Tom
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post #16270 of 16271 Old 09-15-2014, 06:48 PM
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Quote:
Originally Posted by firemantom26 View Post
I currently have been using a dual vertically stacked 4228 and I am looking to replace it with another antenna. I see the replacement for it is the 4228HD. I am not sure that that antenna can be stacked.
I was wondering what the best options would be
Choice 1 Stack a 4228HD
Choice 2 CM-3020
Choice 3 CM- 5020
Most of my viewing is on UHF, very little on VHF only a couple
I am also concerned with the weight of a stacked 4228HD
Thank You
I would suggest a pair of 91XGs. Works great for me and my signals are weaker, farther away than yours and 2 edges. See my avatar. You can add a separate VHF antenna if you want.


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post #16271 of 16271 Old 09-15-2014, 06:49 PM
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Looks great


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