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I have been using an Atlas screw type antenna for several years with my FT-857D mobile.? Recently the antenna has failed to tune and when I push the tune button I only get a beep.? I have tried two different mobile radios and atlas antennas.? The radios are set to Atlas HF & 50.? The voltage is showing 13.5 volts.

Any information will be appreciated.

Are you talking about an ATas 120 antenna? If so, a bad coax will cause what you speak of as will a bad Ground and from your discerption I would be checking the cable and the grounding.
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?Ke4ska
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