Mostly but not entirely true. Last I checked there were still TV stations down to the old Channel 3. only Channel 2 (56 Mhz) seems to have been abandoned. (and I'd not wish to bet on that) WJBK (Channel 2 Detroit, Last I checked was using Channel 7 as their carrier (Channel 7 WXYZ moved their frequency up to I think 41) Yes you need a play card to keep track of the players
The power of the signal. Analog needs higher power to overcome noise and other forms of interference which is way as you move out from the Tower the signal ques 5-4-3-2-1- where did it go. Digital overcomes noise and interference by other means which is why a radio next to me shows interference dang near FULL SCALE but no sound at all (In Digital mode) (Lots in analog mode) but when a digital signal (about 10miliwatts or .01 watt) comes in from the transmitter in the next room. It's like I was sitting next to the person talking.
Penetration of Trees. Buildings and such.. Another radio near me talks to one two receivers located about 10-15 miles west of me.. On VHF Low. I push 50 watts into the antenna to make the trip. on UHF 5 will do it The antenna here is a "Dual band" (One antenna both bands) at the Hospital there are 3 or 4 antennas. The repeaters use one each. (VHF and UHF) but many folks find UHF penetrates better.. Logical. NO. but that's how it is.
(Of course the fun radio .. well the radio is OFF only use the digital parts it talks around the world on 0.00 watts of power.. (VoIP)