I am using a motorola cdm750 voice radio in a carbon fiber race car. The frequency range is 450 Mhz to 470 Mhz and I am currently using a 3db gain antenna and the power is up to 25 watts on the radio. My problem is that as soon as I lose line of sight the radio is nothing but static pretty much. The odd thing is that I am using a data telemtery radio in a 440 Mhz range and I do not lose the transmission when I lose line of sight. Any suggestions to improve this situation? Also would it be helpful to clear up any static if I used a noise filter on the inline power?
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