There are times when transmitting "you got a stuck mic" works, as
odd as it may seem. if I'm near the airport, I have both radios
tuned to the same freq while in the pattern - why? Because it's
habit. Before I replaced both radios, I had problems with
reception. Depending on the distance and location within the
10 m radius, I might have one of the radios cut out on me. So
having another available saved me the time of changing freqs when
close by.

Now that I've got 1 new radio and 1 "kinda new" (refurb) I can
have 1 live and 2 additional freqs monitored. Lots of
information when you live under Class B, and within 5 nm of both
the USAF base *and* the class B airport is really important.