🚀 go-pugleaf

<Mike Pflueger tells about Professor Kraus' solution to carrying
broadcast signals in tunnels using a wire extending beyond the end of
the tunnel...>

	Yup. Never thought about it myself, but that's a great idea.
It'd be topologically equivalent to a coaxial cable, which has no cutoff
frequency for the TEM mode.

	Now *here's* an interesting question, particularly for anyone
like me who has spent half an hour in a tunnel during a traffic jam:
Why do we allow tunnels to be built without such gizmos installed in
them?

	Jeff Carroll
	carroll@atc.boeing.com