Thanks for the info, nuke11.
Having read these, you have a system that could link an above ground facility to an underground installation like a bolthole within a few hundred to 1500 feet. So we have a potential receiver setup for the bolthole end.
Hopefully there isn't too much attenuation by moisture laden or high clay content overburden.
http://www.lockheedmartin.com/data/a...roductcard.pdf
Has some more info including how big the equipment is.
It does not address the Prime Base-bolthole communication link.
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VLF is still in use, but just at a very limited range and Prime Base doesn't need to errect large masts to communicate with the boltholes.
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Why use VLF for short-range transmissions (how far is this, anyway?)
I'll have to disagree here unless you can find a VLF transmitter array that doesn't involve big antennae. TACAMO aircraft obviously have portable equipment, but the multi-kilometer (mile) antenna is a problem.
Requiring multi-hundred metre (yard) length receiving antennae is also a pain in the butt.
What I was looking for was a single solution for Prime-bolthole and inter team communications.
I still think shortwave or meteor burst systems are the best way to provide this, but would appreciate any further information that could change my mind.