Leaderboard

Any tunable antenna should have come with a cutting chart that shows how long the whip should be for a given frequency. Check the chart, measure it, and cut it off to the correct length. If you do not plan on using repeaters, then set the antenna length for 462.600 MHz. If you plan on using repeaters also, then you might want to split the difference, and set the antenna tuning for 465.000 MHz. That should give you good coverage for the GMRS band. If you want to get picky, and actually check and set the SWR, then the first thing you need is an SWR meter that will work on UHF frequencies. The typical cheap CB type SWR meter will not work at UHF. To get an accurate reading, you must also use a 1/2 wavelength cable going into your SWR meter. This is frequency dependent, will vary depending a cable velocity factor, and IS critical. NOW... All that being said, With your UT-72, I believe you have a fixed, non-tunable antenna. It doesn't look like you can set the SWR on it. It is just a quarter-wave whip on 2 Meters, and will function as a 3/4 or 5/8 wave on 440. Either way you look at it, it isn't going to be much good on GMRS, as from what I can see, it is a Ham-band antenna.