Yup, infinite pretty much answered your question.
The other solution is to find a free radio station that accepts diffrent shows on diffrent times. Make a demo mp3 and send it to them. If they like your show, you send them a mp3 every week, and lets say u get 1 hour every thursdays.
Thats the only other way i know of. Btw, opening ports isnt hard at all, just read the manual it came with.
On Linksys, its epecially easy, 2-3 clicks and your set.