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This YouTube video says that pressing FAST + A/B + A+B during power-on puts the radio into Service Mode, allowing you to extend the transmit frequency range. You must follow the steps indicated in the video precisely; in particular, you must set the radio's transmit frequency to the range on which you want to transmit before putting the radio in Service Mode....


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You still need to tune them to frequency just like any other antenna. I tuned my 18 inch to gmrs recently. And I got much better results. So my recommendation would be to get close to the wavelength you need with room to trim down the tape measure on the inside of the antenna. I think it's funny that its actual tape measure inside with numbers and all.


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