Hi Paul,

"Paul Keinanen" wrote in message
news
On Fri, 29 Sep 2006 17:13:28 -0700, "Joel Kolstad"
wrote:

No. The problem is that wavelength of a, say, 10kHz signal is 3km in free
space.

This must be a typo, since the free space wavelength at 10 kHz is 30
km.

Oops, sorry... yeah, you're correct -- my mistake.