Also, some, not many run both a CB and GMRS. The GMRS channel will vary depending on the group/club. When I am alone, I scan all them without any tone. As for the CB, I'll monitor Ch. 16 AM. The other days on my run to Crown King I actually heard some off-roading radio traffic on CB Ch. 16. There were a few Side-X-Sides on the road and I did notice a CB antenna and an UHF antenna on one of them.