Directional Repeater Antenna

[Durake]

Hey all, I have a VHF/UHF Cross band Repeater, and am looking for a dual band directional antenna, I figured I could ask here without being murdered as I have been before on RR. I don't know what information y'all need but I've done some looking around and have yet to find a dual band directional antenna, I'm looking for 180°. Thanks

[berkinet]

Well, avoiding questions of application and legality...

 

I suspect you are going to have a real problem finding something meeting the description you provided. However, given the difference in frequency, why not just use two antennas? It will still be hard to find much below 1 or 2gHz that would meet your needs for directionality. But it would be easier than finding a dual-band directional antenna.

 

However, I think you'll quickly run into the issue of diminishing returns. If you can actually find 2 antennas meeting your needs and also providing any useful gain, you will probably be in the $200+ range, per antenna and the difference in gain from a high-quality vertical antenna would probably be around 3db.

 

My guess is you'd be better off by spending your money improving your feed line and connectors and removing any adapters and then buying a high quality dual-band vertical which should get you gain of 8+dm VHF and 11+ UHF. (Eg. http://www.theantennafarm.com/catalog/comet-gp-9nc-1087.html )

 

You might play with placement of a reflector behind a dual-band vertical omni. But, that would really be hit or miss and you'd have to have the proper test equipment, time and interest.

 

anyway, just my 2 cents worth

[ldcarson]

You could buy a small 7-10 dB Yagi (dual band) with a small rotor and can control the direction with no issues. Make sure u buy Yagi for use on gmrs crews or trim it accordingly.

 

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[zap]

Define 180°

 

 

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[Durake]

Well the repeater is at a spot that will not cover anything East, at all, however, it'll cover everything West. It cuts off North and South at basically 180 degrees. Instead of transmitting towards the areas I can't cover, I figured why not have it with a directional antenna facing the direction I can cover so it can focus it in that area.

 

I attached the image of the coverage, it has full line of sight with the city of Dallas, the red circle is the repeaters location, the black is where the coverage ends or I will have no coverage.

 

(Won't let me attach the correct image, check my next reply for the correct one)

[Durake]

Had to edit it a bit, North is up as always.

[Durake]

Well, avoiding questions of application and legality...

 

I suspect you are going to have a real problem finding something meeting the description you provided. However, given the difference in frequency, why not just use two antennas?  It will still be hard to find much below 1 or 2gHz that would meet your needs for directionality. But it would be easier than finding a dual-band directional antenna.

 

However, I think you'll quickly run into the issue is one of diminishing returns. If you can actually find 2 antennas meeting your needs and also providing any useful gain, you will probably be in the $200+ range, per antenna and the difference in gain from a high-quality vertical antenna would probably be around 3db.

 

My guess is you'd be better off by spending your money improving your feed line and connectors and removing any adapters and then buying a high quality dual-band vertical which should get you gain of 8+dm VHF and 11+ UHF.   (Eg. http://www.theantennafarm.com/catalog/comet-gp-9nc-1087.html )

 

You might play with placement of a reflector behind a dual-band vertical omni. But, that would really be hit or miss and you'd have to have the proper test equipment, time and interest.

 

anyway, just my 2 cents worth

 

Thanks for putting the first sentence in there.. Lol.. Alright, appreciate the cents.