Here is an article that should answer your question:
Also notice the paragraphs about the balun used in some of these antennas.
Here is a link to a long discussion on this balun, which eventually
determined that the manufacturer was including the wrong type balun for
use in this system.
Richard Thorne wrote:
> I have a vertical in my backyard that I currently feed at the base with
> an SG-239 200 watt tuner. I want to increase my power from 100 watts to
> 400 watts. In order to accomplish this I either need a tuner at the
> base like an SG-235 or CG-5000 both expensive.
> The other less expensive solution is a tuner in the shack.
> So how much loss will I have if I tune a 125' length of coax? I know it
> works as I bypassed the base tuner and used my rigs tuner. No problem
> tuning, I'm just curious how much loss I'll have compared to the tuner
> located at the base of the antenna.
> Rich - N5ZC
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