It's funny, but there's this concept of aliens...
That uses 'frequency' as a means of traveling or rather possessing people.
The movie was called "K-Pax". He basically claims that he uses light to travel. Almost like he's a spirit.
So let me get this straight...your basically saying that reality is composed atoms *(solids) and wavelengths *(light and radio). So it's suffice to say that because dimensions exist, it's not so much to say that different universes exist far far away...but rather on a different wave length.
So that might explain how aliens are able to travel. They aren't traveling far, just...changing channels?
Dude...the stuff you tell is like...full on Science Fiction Gold!