gareth wrote:
Whereas the radiating element of screwdriver antennae is tunable over
a wide frequency range, is it necessary to employ a 1/4 wave radial
for each band that it is proposed to work?

The physical type of a vertical radiator close to ground makes no difference
in regard to radials or grounding.

A screwdriver antenna is just a vertical with a variable loading coil.


--
Jim Pennino