It
is sometimes a good idea to check the
DC resistance of your feeder.----Easy if the antenna should look like a short,not so easy if you have to stand on the roof or up a stepladder or a tower, checking a dipole.
Of course,with the former,if there is a short at the other end ,you don't know if it's just the antenna,or a feeder short!
Strangely enough,there is something in the speaker impedance case--the resistance of a voice coil
does give a fair idea of what the impedance may be,to the extent that you can tell the difference between different impedance speakers
of similar kinds.Comparison between a 2" speaker & a 12" woofer may not work so well!