1) To do this, the ITU would have to agree, and with some countries having very few TV transmitters, I can't see this happening.
2) There would have to be a 'robust' safety case to get the CAA to agree.
3) The CAA would probably require the signal to be 'clean' ie not carrying any broadcast material. This would negate one of the so-called advantages, as it would require dedicated transmitters, rather than use existing ones. As a 'for instance', the DGPS signal presently transmitted by commercial FM stations is not accessible from aviation GPS' presumably for this same reason.
Last edited by chevvron; 13th Feb 2013 at 14:53.