Trimble 33580-20 GPS / Beacon Antenna. The antenna is a GPS / Beacon antenna capable of sub-meter performance using the free public IALA Beacon and SBAS corrections or subscription-based OmniSTAR VBS corrections. The beacon receiver provides superior weak-signal performance, allowing differential corrections to be received at long distances from the reference station and during challenging weather conditions. Case Trimble AFS GPS receiver, part number 293594A2, used and in excellent condition. Included cable is for gps receiver to AFS monitor, Case part number 277853. This Case IH universal receiver is off an AFS combine. Many thanks for looking.