Hello,
I've put my SDR (software defined radio) online here:
http://ak7v.hopto.org:8073/Go ahead and give it a try. It will let you listen to HF from 0-30MHz. I've got a small magnetic loop antenna. The performance is decent on the lower frequencies.
The SDR interface has some neat decoders you can try for fax, rtty, etc. under "extensions."
If you're a ham on HF, you can use it to listen to yourself and see how you sound in Wrightwood.
There are a whole network of these radios online all over the world. Check out
http://kiwisdr.com/public/73,
Jason
Edited to add: I've had reports that Internet Explorer doesn't work. Chrome and Firefox do for sure.