On Tue, 10 Jan 2006 16:56:56 -0500, Jon Gauthier
wrote:

I know I can have my AH-4 tuner drive a length of ladder line, so could
he use his AT-140/130 to do the same, and feed the center of a dipole
60' up his mast, with each end insulated at the bow and stern?

The AT-134/140 is not designed to drive a balanced feed line, only
unbalanced. You could probably drive a balun coil in reverse however,
and run co-ax up the mast to a dipole.