"Bob Jones" wrote:

How do you propose to tell the other guy what frequency you're going to use?
There's no question another frequency would need to be used. The issue is
figuring out one both pilots would know to use.

The general rule of thumb is to get in contact with any ATC or FSS
facility, and let them figure it out.

At the high-tech end, I've punched up "nearest ARTCC" on our Garmin-480
when I've flown out of radio range with the guy I was talking to. It only
took a moment for me to explain to the center controller what my problem
was, and he got me a good frequency for the next tracon sector.

Try any approach or FSS freq you can find on the chart. In a pinch, 122.0
(flight watch) from almost anywhere in the country will get you to somebody
who can respond in a useful way to "Sorry to bother you, but I've got an
F-16 on my wingtip, what should I do now?"

If you've got a cell phone, calling 1-800-WX-BRIEF is another ace up your
sleeve.