You're welcome. I don't know what the max channel number would be. The only reason I discovered the 5 digit rule was when I was trying to tune in a local over the air sub-channel. I found that channel 29.3 for example had to be entered as 02903. I also discovered this was necessary with higher channel numbers. On the hopper, the music channels use sub-channel numbers now too. So 99.16 would be 09916. I also have to program them in that format on my universal remote.