I noticed that you are not receiving any digital channels above 25. Some of the channels that you receive from the TV provider are encrypted, for that reason you will need a cable box to get this channels. Since you are using a VCR this might be the problem.
Keep in mind that we have available the Slingbox PRO-HD, which was a built in digital tuner. With this Slingbox, you will be able to scan the digital channels and watch them without any problems.
I hope this helps!