[_moof]

HF radio. Highly depdendent on space weather, but generally I can communicate around the world with only 100 watts and a long wire.

Be aware though that transmitting on any radio is like turning on a giant, extremely bright light bulb directly above your antenna. Anyone with basic radio know-how will be able to hear you and locate you.

[badc0ffee]

I had to think for a second to realize that HF means lower frequency than VHF, not high frequency in an absolute sense.

[_moof]

It's very silly that "high frequency" is among the lowest frequencies, and that we wound up with Very, Ultra, Super, Extremely, and Tremendously High Frequencies!

[quietsegfault]

Back in ye olden days, HF was really high! What we'd consider today to be near useless due to limited bandwidth and insane antenna requirements were once the primary frequencies for communications.