Paul I don't know why I keep trying to explain things to you, I know you don't believe in TANSTAAFL*, but I keep hoping. So I give up on this effort with the following statement.

You cannot get enough power out of various broadcast RF signals to power anything but very low power specialized devices.

*TANSTAAFL - There Ain't No Such Thing As A Free Lunch. An acronym used by Robert A Heinlein in his science fiction stories. Out of science fiction, but very true

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.