MFR401, I'm not sure which four frequencies you are referring to; I'm only showing three in my notes:
467.9375 (WPJZ677, expired)
462.9875 (WNKK898 / KFM561)
463.1625 (WNKK898, associated to WPRF775)
and my understanding is that those three are purposed for select point-to-point use and for mobile extender use into the existing 160.2800 system.