[Elecraft] Center-fed antennas

[Bill]

Might I suggest a Common Mode Filter, such as that sold my myantennas.com?

My standby antenna is an endfed half-wave from the same source. It hangs 
from the eve corner and is noisy - the kind of noise that comes from 
today's modern household. I put a CMC Filter on it right at the bulkhead 
here in the shack. The antenna is now as quiet as my NVIS a hundred feet 
from the house - which is no local noise at all.

I have used the coax through the wall to a balun and 4" feeder with 
excellent success with a PalStar AT2KD (very similar to the MFJ tuner 
you mentioned).