Saying it is' a "whip" does not tell us much.

It's a 64 inch whip on a Radiall/Larson magnetic base that contains
the frequency matching coil, from Tim@W&W.

If I understand you, the ground plane *radius* has to be at least 64
inches. That's one big piece of sheet metal! I'll have to make due
with 12, unless that's going to bother my radio when I xmit.

2NO