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In plain english, what G744 said is the AS3900 and antenna will cover a very wide spectrum of frequencies without any modifications. The MX6707 base requires the frequency range to be manually (or electronically if you have the control cable with the proper switch on the other end) set to the...

Grinding on the end is likely to damage more than it fixes. It's not 'just' a piece of metal. If I remember correctly the antennas are more like an array of different lengths (electrically) and the transmit signal goes up the path of least resistance. That 'least resistance' may still be a...

I have not had an operational CB in over 30 years! You are correct about the AS-3900, it is 'supposed to be' close enough for military use in the entire spectrum they are using. Modern US military radios use frequency hopping extensively as a security measure.

I have not dealt with the AS-3900 base, BUT, you should be able to put an SWR meter inline between the radio and the base and see if it can be adjusted for the frequency you are using. SWR - Standing Wave Ratio see this site for more information >...

Correct, the only 'power' is the radio signal that you will be transmitting through the coax. The other cable did transmit power to the stepper motor to change the SWR for different frequency ranges in the 30-75 MHz range. You will not be doing that, because the frequency range that you will...

The base has the antenna coax straight from the radio - the SWR meter goes in that line. The other cable is strictly for changing the frequency range from the radio itself, but that can also be done with the base itself, mechanically. Once set for the lowest SWR, you simply leave it alone, and...