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I,am currently running an unbalanced coax feedline from a G5RV into an MFJ-994 autotuner. The tuner is also capable of tuning a balanced line but you can not have two different antenns connected to this tuner at the same time. My second antenna is an endfed which I would like to be able to switch to without disconnecting the coax line first. MFJ makes a MFJ-w9inn balun which will convert a 400 ohm balanced line to a 50ohm coax feed. The problem is my endfed, as a single wire feed, presents a 50 ohm impedence against ground. I suspect the w9inn balun will not work in this configuration since it wants to see 400 ohms. Anyone have any ideas on how I could convert the 50 ohm endfed antenna to an unbalanced coax feed? If this can be done, I would be able to switch antennas with an external antenna switch,

i had a simular problem at one time.
i ran a coax out of the tuner to a switch with 3 antennas attached to the switch.
i had no more problems after that.
if i were you i'd get a good antenna switch and try that.

Thanks for your reply. Perhaps I didn't state my problem as clearly as I should have. The endfed antenna connection I wish to run to the autotuner is a single wire, not a 400 ohm ladder lead or coax. This single wire needs to be terminated with a PL-259 in order to be able to run it thru an external antenna switch. I need some kind of a mathing device in order to do this.

for a single wire feed and pl259, just solder the wire to the center pin.
the rest will be taken care of in how ever you originally had it connected to the tuner..
its possible you would need two say 2 position coax switches to accomplish this.
one to flip flop between the so239 and the single wire connection on the tuner if it has one. the other to switch the input to that switch from multiple antennas..