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Over the years I haven't had too much luck trying to fit(i.e. tune) a broadband antenna to a mobile application. Its a whole lot easier using a mobile antenna that designed to work in the frequency band of the transmitter. Most adjustible load mobile HF Antennas are INHO not rugged enough for...

Thanks for the help Clarification Ten, I like to get guys with little radio experience to try and follow me and think out the obstacles. I wasn't able to pull up specs/install manual on the antenna to figure out the type and tuning ability of the antenna. Even if the antenna would resonate...

Looking at the TM for your Radio its not designed to transmit on 27Mhz, (the lowest usable frequency is 30Mhz. https://www.radionerds.com/images/a/ab/TM_11-5820-401-34-2-1.pdf Without significant internal mods you won't get this radio to work on 27Mhz.

Here's an explanation on SWR and HF Antenna tuning. Tuning Your HF Antenna

It looks like the antenna is a Broadband antenna. Your available power will more than likely be used up by using such a Broadband antenna. Is there a Band Specific Mast that can be replaced for 27Mhz? The other option is to call the manufacture and ask them if the antenna can be tuned (by...

Two things to overcome. Do you know how to use an SWR Meter and tune an antenna? I'd have to see is the AS3900 has the bandwidth to tune for 11 Meters, ( 27Mhz, the CB Band) Connecting the ground strap of an antenna is an important part of creating the "ground plane" part of the antenna...