 Type 281B had combined Tx / Rx antenna.First fitted to then This set also had a secondary surface search function along with aerial and surface gunnery capability and used a Precision Ranging Panel.The Type 281 ranging system allowed the user to select either a 2000yd to 14000yd or a 2000yd to 25000yd range display with range accuracies of 50 or 75yds RMS, respectively.