"Richard Clark" wrote
Mike wrote:
Echosorb, a popular microwave RF
absorbent material that is available in sheet form. It ranges from a
1/16" thick pliable rubber to thicker, multilayer foam that looks like
the black antistatic foam used to ship IC's and other semiconductors.

Hi Mike,

It is also quite heavy which would be inappropriate for aviation
applications. I played with this stuff a dozen years ago when one of
my buddies got a speeding ticket in his 'Vette. He asked me to design
a stealth bra for his ride - it didn't seem to be practical for any of
several reasons.

I was going to paint a whole-car with the RAM-paint used on my submarine
masts. Until I saw the price. Cheaper to pay the tickets ;-)

Jack