In message , rickman
writes

I've a 5 foot Octagonal loop for MF. The shield is copper water pipe,
with a gap , 7 turns inside plus a coupling winding. It does a good job
eliminating local noise (mostly ASDL hash from the phone lines) compared
with a vertical. However the capacitance between the shield and turns
seems to load it quite a bit meaning I can't get the tuning range I'd like.

I assume there is nothing to space the wires from the pipe other than
the insulation. Maybe you could use wire with thicker insulation? Or
if you are using straight pipe, could you use a fabricated spacer at
the corners? I guess that might be hard to assemble with soldering the
joints.

No just the insulation. It was hard enough to thread it without spacers
..

I should have stuck to the original design that used plastic pipe with
aluminium foil stuck to the outside

Brian GM4DIJ
--
Brian Howie