antenna capacitor

I have used my small loop antenna (which has a main loop and a coupling loop that can be tuned using a variable capacitor) with an AM radio receiver to receive MW broadcasts. However, the small loop antenna which was made by me was not working properly but when I connected a ferrite rod loop...

Hi all :) I have a straight piece of 3/4 inch (~10mm) diameter copper tubing that is around 40cm long. It’s being used as an antenna as part of a Theremin circuit I’m building; essentially this means that this copper antenna is acting as a capacitor to ground, and has its own (tiny) capacitance...