The AT575-493 is a FAA TSO approved L1 band GPS antenna that can be used with GPS Receivers approved for operations in WAAS Class Beta -3, LPV approaches. WAAS Class Beta-3 is a performance standard for GPS systems that allows for LPV (localizer performance with vertical guidance) approaches.

TSO WAAS L1 GPS antenna

The AT575-326 is an ARINC 743 sized L1 band GPS antenna that is FAA TSO C-190 approved and has a slightly offset TNCF connector.