I have Tektronix 502A Dual-Beam oscilloscope, and manual. Some years back I replaced the bad tubes but did not calibrate it. I also have a home made 2 m copper J-pole and steal masting for it, 10 feet. I am moving, and have not used either of these items in a long time. If you are interested let me know. They are both free, and in working order. Aaron KD6FLM