You either have the Furion antenna or the Roadstar antenna made by Winegard… in either case the preamplifier is mounted in the head of the antenna…
You could however install a DC noise filter or choke at the 12 volt DC source switch …
See image of plus and minus leads on wall panel switch backside of switch…
However.. if the antenna preamp in the antenna head is picking up RF from LED interior lights or the converter you may have better results by decoupling the RF being picked up via the coax cable..
First image is wall plate switch…
Second image is how to decouple TV noise picked up on the coax lead and the 120 volt AC power feed plug line for the TV set..
Link to Furion OTA antenna if you have Furion unit..
https://cdn.accentuate.io/1906137038...3740621551.pdf