An antenna apparatus comprises selectable antenna elements including a plurality of dipoles and/or a plurality of slot antennas (“slot”). Each dipole and/or each slot provides gain with respect to isotropic. The dipoles may generate vertically polarized radiation and the slots may generate horizontally...http://www.google.de/patents/US8068068?utm_source=gb-gplus-sharePatent US8068068 - Coverage antenna apparatus with selectable horizontal and vertical polarization elements
