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In the search for lower dielectric constant substrates for use in a high critical temperature superconducting (HTSC) microwave technology, the dielectric constants and microwave loss tangents determined from the complex dielectric properties measured at 10 GHz and 300 K are reported for numerous perovskite antimonates like AzMeSbOs where A=Ba or Sr, Me = a rare-earth, Y, Sc, Ga or In and A4MeSb3012 where A=Ba or Sr and Me=Ei, Na or K. Using these material properties, the Clausius-Mossotti relationship and a nonlinear regression fitting program, the polarizability of Sb5+ has been investigated and determined to be 1.183.49 di3 which makes it an excellent candidate for use as a constituent in a HTSC microwave substrate technology.