FRT-70 (SBT-1K), FRT-39 (GPT-10K), and FRT-40 (GPT-40K) at NAVRADSTA(T) Guam - probably around 1968-69 https://www.navy-radio.com/xmtrs/frt39-40/Guam_Communications_Station_209.jpg Cheers, Nick England K4NYW www.navy-radio.com