A CATV network distributing signals below 860 MHz is modified with a secondary transmission bi-directional capability above 860 MHz by adding filters to separate modified mobile-communications frequencies (above 860 MHz) from typical CATV services (below 860 MHz). CATV subscriber termination points function as extremely localized ultra-miniature cell sites within a building. Multiple cellular networks and possibly multiple providers are simultaneously accommodated over a CATV network. The modified network simultaneously handles traffic in combinations of known cellular air interface standards such as: UMTS, GSM, TDMA, CDMA and PDC. Cellular mobile radio terminals do not have to be modified. Signals traverse on non-utilized CATV frequencies. CATV active elements are modified, and new components are provided. A Cable Mounted Cellular Adapter at the CATV outlet acts as a transmit/receive unit and frequency translator for the cellular signals.