"Dale Parfitt" writes:

The effective 2M antennas (Antenna Specialists) accomplish the
lossless fed through because the radiator is voltage fed half wave and
the interior coupling unit has a hi--low Z transformer. You could do
the same at 10M by converting the 50 Ohm feed to a higher impedance
and then down converting outside. The downside is that this will
likely limit your bandwidth a bit.

Dale, this is interesting, although my initial challenge is just to get
capacitative coupling through glass without much attention to the
impedance on either side. I hope/assume that at 10 meters, paralel metal
sheets under a foot in size will represent just an impedance affecting
signal strengh a bit, not something in need of tuning.

When you speak of "radiator", I assume you mean the antenna itself
rather than the metal sheet that is inside and radiates through the
glass. I'm running a magnetic loop antenna, with an antenna tuner inside
the building at the transmitter end of the coax.

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Haines Brown, KB1GRM