Mounted on top of the tail fin and facing forward, these radio antennas were used for overwater, longer journeys. An instantly recognizable feature of the Boing 707 as in subsequent aircraft design these antennas were embedded in the tail fin or wings. Also found on early Boeing 720 models as well as the military version of the 707 called the KC-135. Aluminum polished to mirror finish. UPS Ground Shipping. Final Sale, no returns.