Dielectric, the leading manufacturer of broadcast antennas and RF systems for TV and radio, has shipped two stacked antenna arrays to American Tower for repack projects in the Dallas and Boston broadcast markets. The antennas incorporate Adaptive Polarization Technology (APT), allowing individual broadcasters to select their own polarization ratio independent of the other stations operating in the same array. The addition of the vertical component will be beneficial to improving reception for both ATSC 1.0 and future ATSC 3.0 over-the-air broadcasts.