Section 90.717 - Channels available for nationwide systems in the 220-222 MHz band(a) Channels 51-60, 81-90, and 141-150 are 10-channel blocks available to non-Government applicants only for nationwide Phase II systems.(b) Channels 21-25, 26-30, 151-155, and 156-160 are 5-channel blocks available to non-Government applicants only for nationwide, commercial Phase I systems.(c) Channels 111-115 and 116-120 are 5-channel blocks available for Government nationwide use only.62 FR 15994, Apr. 3, 1997