I was testing a new VHF handheld the other day, and I switched to
Channel 9 and asked for a "radio check" from anyone who was picking up
my signal. Got a couple of good responses, including one farther away
than I thought a handheld could reach, and one response from some
a**hole who was "annoyed" that I was asking for a radio check.

He said, "use another channel, dammit."

Well...

I know channel 16 is inappropriate for a radio check, but I always
thought channel 9 was just fine.

If you want a VHF radio check, what channel do you use?