Not sure they're wing nuts; maybe just want a QSO without 10 breakers. I can cruise a band pretty quickly with the gear driven CR88. Turn on the BFO and roll it down the band listening for heterodynes. Balanced feed for balanced antenna: center fed dipole. no balun at the feedpoint. AM doesn't seem to co-exist with baluns all that well, except for a link coupled network which is sort of a tunable balun.