Re: Looking for advice on antenna placement for our radio club repeaters.
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Hustler G7-220....only G6 they make is 2m or dual band?
A Spectrum SCR 1000! Glad to see it's still chugging along. I knew Joe DeCorsella , I think I spelled that right, from there start in the '70s. I have an S7R on 220 myself but I've got to recrystal it for my new pair.. same RF boards anyway. Tuned up properly they just work. Always has great audio!
Chris WB5ITT?
You would be better off finding an old 450-470 db loop style db408 for the GMRS machine. Most two way radio shops have them laying around fakes down from commercial sites. I picked up 3 of them for under $100 each. This is my 220 site on a hustler g6-200 and the GMRS next to it on my 106 foot cow crank up tower. And my cabinet with the Motorola GMRS repeaters and my trusty soectrum 220 machine
Neal KA2CAF 
On Tuesday, May 6, 2025, 7:12 AM, wj9jrg via <wj9jrg=[email protected]> wrote: 712EFC is not a repeater antenna.? It's a base antenna not made for duplex operation.?? It has braided copper coax inside.?? That's why Comet calls them base antennas.? You will find the issue as duplex noise.
Andy WJ9J
Out club has a 55 foot tower on top of a high point in our county. We are in the process of upgrading the feedline and replacing the antennas. Our coverage for the current 2M/440 antenna at the top was excellent before we had feedline issues. We also currently have a Comet CX-333 tri band antenna side mounted on the tower. The base of CX-333 about 16 feet below the top of the tower. It has had decent coverage on 220 in the past but has recently degraded the last year. It will only be used for 220 operations. The reason for the tri-bander is that it has served as a backup antenna for the top 2M/440 currently and in the past due to antenna / feedline failure.
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The club is adding a GMRS repeater to the site and the main question I have is, what is everyone¡¯s opinion of side is mounting a Comet CA-712EFC directly opposite the 220 Tri bander. ?Both standoffs are around 2.5 ¨C 3 feet off each side of the tower.
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Also is there a rule of thumb on how much separation I should have from the top of the two side mounted antennas to the base of the top antenna?
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This is what I have for the install:
Top of Tower - Comet GP-9 GP9N 2m/440 fed with 7/8 superflex ¨C 25 watts
Side Mount - Comet CX-333 (Used for 220Mhz) fed with 7/8 superflex ¨C 10 watts
Side Mount - Comet CA-712EFC (GMRS) Fed with ? superflex ¨C 25 watts
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Thank you for your time!
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Chris Boone WB5ITT
