re: " there is only like 7.5 kHz left between them." Think about this for a second or two - HOW WASTEFUL would it be to include an UNUSED FEW kHZ between each channel assignment? Spectrum-wise, spectrum is a limited quantity or resource, and NOT to be simply abandoned! We have had adjacent channel frequency allocations in the land mobile, the cellular (going back to AMPS days) and even in FM Broadcast - what matters is, PROPER frequency and distance planning as is done in FM Broadcast - like, NO adjacent channel allocations in the same market!! It's okay to be the next 'market' (75 to 100 miles) away. Something similar was done in analog cellular, no adjacent channels cell to cell WITH the exception if the two channels that were adjacent were in the SAME cell site which meant BOTH signals would be at the same level, if present, and that worked well given the FM "capture" effect. We stuffed "adjacent channels" in the Wichita Falls MSA in the downtown WF site in the mid 1990s for instance on account we needed ALL the channels we could muster to handle traffic demands given a free nights and weekend promo marketing had instituted.