Mag base buffer

no the signal may not be an issue but it may not stay on the car.

felt collects grit which scratches the surface, the best thing to do is wipe the antenna bottom when you mount it on the car.

 

use a cheese cloth, it is more porous than ordinary cloth and will (should) allow better sticking of the magnet.

personally if it were me, i'd try and get a clamp on trunk mount, attach it to the side of the lid.
https://www.walmart.com/ip/Tram-BR1...62769&wl11=online&wl12=43523908&wl13=&veh=sem

Trunk Lip CB Antenna Mounting Kit

less likely for the antenna to fly off or be knocked off, causing more damage to your car.

 

lol..."cheese cloth".... fender, or hood mount.
it attaches under the hood to the inside of the fender and sticks up between the hood and fender.
....It's either this, or a glass mounted antenna...or drill a hole.

 

I used one of these that I made on the front fender of my S10. Much better rf ground than anywhere on the bed.

 

I use magnet mount antennas and have no problems with scratching or losing adhesion to the vehicle.

As noted, make sure the bottom of the mount is free of grit, as well as the surface on which it is placed.

When removing or installing the antenna, make sure the mount is not dragged across the surface but, instead, is tilted on and off without such movement. I remove my antenna frequently, so there is no retained moisture underneath which, if left there too long, can damage the surface.

Any paint damage I have on my vehicles has come from other vehicles' doors in parking lots, chips from flying stones on the highway and blemishes from insect bodies, bird droppings and tree sap. The magnet mount antennas I use are of little concern or consequence in the great scheme of things.

I don't find the need to place anything between the antenna and the vehicle. When I first began using magnetic antennas I tried using thin plastic beneath the bases to see if it made a difference, but found no benefit from doing so. If anything is used beneath the antenna, make sure it is as thin as possible because any elevation of the antenna from its counterpoise / ground can degrade the signal and also can reduce adhesion to the vehicle.