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We address the problem of coexistence between neighboring cognitive wireless networks operating in the TV White Space (TVWS). We derive an interference model to predict the range and level of interference generated in the TV bands by portable low-heigh antenna cognitive wireless access points (AP) in suburban and urban areas. Based on our model, we provide an analysis of the spectral availability (SA) for either the scenarios where dynamic frequency selection (DFS) coexistence technique is employed or not. We derive the steps of our analysis and provide, as an illustrative example, the expected coexistence performance of TVWS enabled cognitive wireless APs in Japan. Our analysis demonstrates the intrinsic relationship SA holds with the TVWS channel set as well as statistical information, e.g., house-hold density of wards and cities, Internet penetration, White Space (WS) radio AP market penetration.