Stock hr2510 through cigarette plug. Wilson lil wil magnet mount on trunk. Chevy sonic. I didnt go battery direct no easy way unless i drill firewall. If i do go battery direct and get a wilson 1000 will that correct my problem? Im still dumb founded by only having the problem ln some channels only with antenna plugged in though.
Cigarette lighters are not ideal places to get the power. The wiring for the lighter plug is bundled in with a lot of other stuff in the car, including CAN bus data network, other noisy electronics, etc. Coming directly off the battery really is the right way to do it. Finding existing paths can take some work, but so far I've never had to drill a fire wall in 30 years of doing this stuff.
But...
Since the noise stops when you disconnect the antenna, it indicates that is where it's coming from. Some things you can try:
Move the antenna to a different location and see if that helps.
Reroute the coaxial cable away from other wiring.
Ground the radio chassis directly to the vehicle body with the shortest path possible. Do not rely on your coax or negative power lead for your RF ground.