24, 47 and 76 GHz
Above 10GHz lies the start of the millimetre-wave bands, and is also an area where amateurs have Primary allocations. Of these 24GHz is the most popular with a significant beacon network and the most well equipped stations capable of EME.
The compact high gain dish antennas at these wavelengths enables very portable equipment, which can take advantage of the Rover rule in microwave contests.
In the UK, the narrowband activity centres are at:-
24048, 47088 and 75976 MHz
24GHz: Note that no operation is currently permitted in the UK at 24050-24150, nor is any new activity recommended above this in the secondary allocation (old centre 24192 MHz)