But in emergency/expedient situations, it would be really handy if one
could pass at HF, say, 100 watts of RF energy through a window ....

Over on eHam.net there's a recent article on building yourself a simple
rectangular wooden panel to stick in the frame of an (open) window. You then
just drive holes in the panel as needed to run cables, etc....

I can just see me now:
* Drive to the High-n-Mighty Hotel where I'm to provide communications
for the Red Cross (or Salvation Army) shelter
* Ask the desk clerk for someone to help me carry my sledgehammer and
other stuff in my grab-n-go kit to the shelter
* Walk into shelter where x-hundred shelterees are fast asleep
* Take sledgehammer and bash a hole through a window
* ....

Nope, that's just not gonna work!

--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)