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FYI, the Nagoya 771 will actually reduce your transmit abilities on GMRS frequencies. It’s meant for 2m/70cm and the antenna itself is tuned to operate up to I believe 440 MHz. GMRS is 460 MHz, and outside the optimal frequencies for the 771 antenna. You’re better off with the stock antenna or a 701.

Berkinet had mentioned that: "GMRS power output limits are specified as power output from the radio (I.e. at the antenna connector) rather than ERP." Based upon 95.1767 GMRS transmitting power limits, here is how I understand the rules and hopefully explains my earlier comments: On the eight main/repeater 462/467 channels 15-22, GMRS stations are allowed to operate up to 50 watts output. On the seven 462 interstitial channels 1-7, GMRS mobile, hand-held portable and base stations must not exceed 5 watts ERP. On the 467 interstitial channels 8-14, only hand-held portable GMRS units may be used and they must not exceed 0.5 watts ERP. That is why channels 8-14 would not be found on legal GMRS mobile and base rigs since that type of equipment are not allowed on those channels. The hand-held units are allowed to operate on those channels under GMRS rules. Even on the seven 462 interstitial channels 1-7, many of us may be exceeding the ERP levels since we may use higher gain antennas with low loss feedlines and I suspect most transmitters are typically preset for 5 watts output. I wish the FCC had allowed GMRS stations to always use output power. Imagine how difficult this is to understand for the casual GMRS operator. This is why we tend to operate on the main channels when using GMRS equipment.

Talking about running low power... I have found that the distance coverage for usable comms is near unchanged, going from 5 watts to 40 or 50. Typically 1 s unit or less. I almost always just run 1 watt unless I am working a repeater that is more than 10 miles away or deaf.

You are good to go with the antenna. Its pre-tuned. Just be sure the negative side is properly grounded, add a ground strap from the hood to the top of the inner fender and the common ground under the hood or the negative side of the battery. You will see improvements with CB performance, too.

Hey Ken, what berkinet posted is a great resource. Myself I usually will just give the callsign that way they don't have to worry about it. I'll simply call them by their name rather than a unit number. But either or is acceptable.

Check our this topic... https://forums.mygmrs.com/topic/1136-on-the-air-id-requirements/