I dowloaded the trial, and the application starts then the "User Permission Check" screen pops about using airtime. After I reply "YES", then I get the "Tuning to MobiTV Promo" message on the screen and the progress bar moves from left to right.
All during this time the "mobiTV Receiving Signal" screen is displayed. Unfortunately, that is a far as it gets. It never actual displays the Demo Channel.
I am using a Treo 600.