I am making a simple 1/4 wave ground plane antenna and have two rather
silly question regarding its measurements.

1. I've attached an SO-239 connecter to a 5x5 inch aluminum plate.
When measuring the length of the radials, I measure from the center
conductor of the SO-239 to the end of the radial taking into account
the plate, correct?

2. If I make a loop in the vertical radiating element so that I may
hang the antenna, does the circumference of the loop count in the
measurement of the element or the diameter? (e.g., if I need 20 inches
for the element, do I measure from the bottom of the SO-239 to the top
of the loop or do I take a 20 inch wire and make a loop not caring
that it has shortened the element slightly?)

Thanks

Bam Bam