Simple solution, remove the transmitter part of the
system. Bye bye TV tower, cell phone tower, and all other emitters with enough signal strength to be used
by the detection system.
"Passive" really isn't correct, since there is an active
transmitter involved, just at a remote location from the receiver.
Thank you for adding some common sense to this debate. I remember when this was first reported widely during the Kosovo action. Everyone thought, "Oh my! Stealth is defeated!"
For crying out loud, you can still see stealth aircraft through a telescope, too, but that doesn't mean stealth technology is defeated! Physics is constant. You don't get a free lunch, ever.
If there's a counter-measure, there's a counter-counter-measure.