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a UHF 1/4 wave is 6". Not sure why you say they are all over 7". Not in UHF. As for the phantom think of that as a rubber duck jammed inside a pepper shaker. If you have local repeaters that are good it will work ok but are junk for any distance.

That is called “desense”. The radio that is transmitting, although transmitting on a different frequency, is actually desensitizing the receiving radio thus rendering it incapable of extracting the desired signal. It is the same effect you and your eyes suffer when you look in the direction of a bright light. Suddenly your eyes cannot make out the detail of the less bright items around you until the bright light is gone. The better the receiver design is within the radio the less it is affected by this. As Skyline said, put some space between the radios so the off-frequency transmitting radio is “less bright” to your receiving radio. Michael WRHS965 KE8PLM

I had been looking at the wrong antenna's I guess. Most were like this one. https://www.buytwowayradios.com/wouxun-ano-050g.html which is 31". And I wouldn't care if it was going on the trunk of the Kia. However on the roof of a lifted truck ducking under mesquite trees, I wanted much more low profile. As far as repeater coverage nearby. My area is pretty fantastic. So if I need to yell for help, Lemmon 650 is seriously good coverage in my area. But using to talk with others on the trail with me this should be just fine with the one from antenna farm.

AB450. "Unity" gain. Zero. Work fine. Gain is overrated/misunderstood maybe. https://www.theantennafarm.com/catalog/index.php?main_page=product_info&cPath=191_192_196_213&products_id=4476 Sent from my Pixel 4a using Tapatalk