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In this paper we present a framework to better exploit spectrum resources of a TDMA/FDMA based primary system through a secondary usage of spectrum. The secondary users of the spectrum are the nodes of an overlay cognitive ad-hoc network, which opportunistically transmits in data channels left unused by the primary system. The focus of the paper is on spectrum decision to properly select the best available data channel where to opportunistically transmit without interfering to the primary network. Spectrum decisions schemes are proposed and compared in terms of improved spectrum usage and interference caused on the primary system.