[gravypod]

You can also go very long distances if you use forward-error-correcting protocols like JT9 or WSPR.

WSPRNet[0] is a network of WSPR transceivers that use milliwatts to communicate across the world. It's just.... very slow.

Edit: And this is very frequency dependent.

[0] - http://wsprnet.org/drupal/

[vvanders]

Yeah, I've been wanting to try JT9 but haven't picked up a HF radio yet. Some of the moon bounce stuff is just incredible.