Jim Weir wrote:

Did you really read what the guy had to say? Do you know that a j-pole at
121.5
is longer than a B-17's rudder assembly? Do you understand that you have
to radiate equally efficiently at both the fundamental and second (NOT
third) harmonic?
I still contend what I said earlier.
Most older C-150's that were retrofited with an ELT use an ELT with a whip
(1/4 wave) fixed to the ELT with no groundplane. Would I recommend this for
a com radio? no! but it does work in thousands of C-150's (and probably
others I'm just familiar with 150's). anyway KISS is the best.
John