In article , Irv Finkleman wrote:

If you were to make the antenna a ground plane or vertical and use a piece of
copper clad circuit board as the plane, it might provide a good degree of
isolation from the other components below that plane.

Irv & Jin-

Also consider making a "patch" antenna using the circuit board ground
plane. Of course the size will depend on operating frequency, and it will
probably not be as good as a ground plane antenna.

I don't have any references, but a web search should find information on
patch antennas used on UHF and higher frequencies.

73, Fred, K4DII