I have to remove the antenna from my Multi-Rotor to get it into the boot of my car, this has on a couple of occasions led to me almost powering up with no antenna attached. this would obviously lead to my transmitter frying, so I made a 'remove before flight' flag to remind me.
But i'd like to make a flag to replace the antenna with the same impedance as the antenna, just in case the flag doesn't remind me.
how would I measure the impedance and what could I use to replicate its impedance?