This depends on how you foresee the ATC tower being used. Typically, each controller will need 1 or 2 Ground to Air frequencies to carry out their role. They may be VHF, UHF or a mix. Occasionally an HF radio is required (which is usually hand mic operated from the console) and Ground to Ground radios may also be required. MATC has supplied a solution with as many as 12 channels (6 UHF and 6 VHF transceivers in a Main Standby Configuration) with an HF radio for shared use, but we have also seen requirements that simply need 2 radios for our smaller solutions. The best advice is to ask your ATC Controllers what their requirements are and discuss this with us to see what the impact is on the limited space available in the tower. We will do our best to accommodate any reasonable request.