I could be wrong but the very first Bell HD Receiver, the 6000, had a port at the rear which in the US of A, was for an OTA Module. These were being installed by Bell Customers and allowing them to get OTA and Bell on the one STB, a great idea back in the day.
Bell however, never endorsed the Module and if an Installer went to a fault on a 6000 STB and a Module was installed, he would first remove it and then troubleshoot the issues. The 6100, had the OTA Tuner built in, along with the 9200 and subsequently the 6141 & 9242 models.
Again, I could be wrong but I think the 9200 would scan for analog and the 9424 did digital as well? The 9242, was IMHO the best unit Bell have ever put out. OK they did have hundreds shipped out from Echostar with the Case Fan running in reverse, causing massive overheating issues....lol
In this new Digital age where there are just so many ways to get the same channel, having one STB to do it all, is long gone.
There were lots of 'additions' that were available to Dish Customers that just never made the leap to Canada, additional storage space via a port on the rear of the 5100, 5800, 5900 PVR's for example. It must have been almost 10 years ago, at a Bell Roadshow, we were promised the radical new Dish Hopper & Joey, solution. I set one up in an Office at Wynford Road. Dozens were installed across Canada, for the Bell Top Brass, while the paying public got ZIP.......
Oh, what might have been.