"Gary G"
shared these priceless pearls of wisdom:

-I've wondered if it is legal to utilize an "unused" frequency to communicate
between planes or
-to someone on the ground for non-critical communication?

Absolutely not, unless the "unused" frequency is assigned by license to either
you or the ground station. There is only one air to air frequency for airPLANES
(122.75) and another one for rotorwing aircraft (123.025). (Ref 47CFR87 sub F)



-Is that legal?

Again, illegal as hell unless one of you has applied for and been granted the
FCC (not FAA) license for the frequency for the purpose intended in 14CFR87.

Jim


Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com