From 1989 to 1991, I was net control for all the American hams there on 2 meters each week. I was assigned the call sign HL9GN in accordance with USFK Reg 105-70 by by HQ, US Forces, Korea, APO 96301. I had an ARX-2B Ringer Ranger on top of a 20 foot pole on top of the third floor roof of my dorm on Osan AB and was putting 70 watts into a near perfect match with a pretty short RG8X run. I had American hams checking in south of Camp Humphries, so, I'm pretty sure I was heard north of the DMZ and I'm pretty sure there were some folks north of the DMZ that were recording me each week for further analysis by their "higher ups". I never received any SWL cards... Edit: HF was tough. 100 watts. And the 10KW Japanese stations dominated the bands.