ORIGINAL: tilsonm.
What kind of flag do I use on a freq hopper?
The AMA requirement for a colored antena flag to denote the band you were using i.e. yellow for surface 75, red for air 72 and black for the ham bands was dropped after the 2001 membership manual and is no longer recommended by the AMA.
Your local club may require anything they want of course but there are no color coded flag requirements for any systems from the AMA any more.
John