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The 3900 also has a big power wasting 50 ohm terminating resistor in it. It has a bad habit of frying itself and is probably the most common cause of their failure. I've replaced plenty of them and brought the antennas back to life.

Hey guys, back when I learned radio antenna theory we always thought a lower frequency antenna needed to be LONGER than one on higher frequencies. Grinding will not make your antenna length longer! Just sayin'.

Hi Mike, The AS-3900 isn't adjustable as far as the frequency is concerned like the AS-1729 and I've never swept one to see exactly what the range is but the VSWR meter should give you a clue as to whether or not the 3900 will work with a CB set on 27 Mhz. Do people still even use the Citizens...

All you need to do is to put the SWR meter in series with the BNC cable to the antenna base and then turn the frequency knob until you get the best antenna match. ie, When the SWR is the lowest. There's no need to disassembly anything.

See this old posting: https://www.steelsoldiers.com/threads/radio-question-from-newb.104797/#post-1333907

The antenna masts are fairly inexpensive but a PITA to ship!!

What you've read is correct. The advantage of using an MX-6707 for your antenna beyond it's appearance is it's tunable base. I would definitely recommend against gutting it because good units are getting harder to find and it's a great military antenna to use with lots of radios. My...