The Ground-to-Air Transmitter (GAT) Site for the BOMARC Missile Test-Firing Facility at Hurlburt Field, FL, was located on the mainland a few miles north-northeast of the missile site which was located on Santa Rosa Island.

The original GAT facility at Hurlburt Field was comprised of two SAGE data-link transmitter types: omnidirectional transmitters and directional transmitters. From the recent photos, it appears that the final configuration utilized only omnidirectional transmitters.

The original omnidirectional-transmitter tower site was situated at the west end of the GAT facility, centered near Latitude 30° 25` 18.3" N, Longitude 086° 47` 39.0" W.

The directional-transmitter tower site was situated at the east end of GAT facility, centered near Latitude 30° 25` 18.2" N, Longitude 086° 47` 32.0" W. [Omnidirectional antennas are seen there in the recent photos.]

Side note: The prototype of the directional-transmitter feedhorn array was field-tested at the South Truro Test Site on Cape Cod, MA, and a good photo can be viewed at http://www.radomes.org/museum/photos/MITRETestSiteSouthTruroMAtddl.jpg. Other antenna types are also seen in that photo, including the antennas for the prototype AN/FRT-49 (a linear amplier for the AN/GKA-5, mentioned below).

BOMARC "A" Model Missiles utilized Frequency Division Data Link (FDDL) transmitted from an AN/GKA-4 transmitter unit. This is what would have been used originally at the Hurlburt Field BOMARC Missile Test-Firing Facility.

BOMARC "B" Model Missiles utilized Time Division Data Link (TDDL) transmitted from an AN/GKA-5 transmitter unit. This capability would have been added later at the Hurlburt Field BOMARC Missile Test-Firing Facility. It is not known to us at this time if the AN/FRT-49 amplifier was also used here (we speculate that it was not).

TDDL transmissions used the same antenna types as voice radios. Two such antennas on wooden poles can be seen near the metal towers at the east side of the GAT facility (where the directional array was) in the recent "Bird`s Eye" aerial photos, especially the south- and west-looking views.