I may be able to help. I have a TS-160 with the RS Double Bowtie indoor antenna. I've been able to get all of the channels here at my apartment, but it wasn't easy. You should be able to get 4 of the 6 channels though. NBC and CBS are a problem because of NBC low power transmitter and CBS is a lot farther away (Hutch). I can get them both, but sometimes I have to move my antenna to get one or the other to work.
Are all of the channels except 12-1 showing up in the guide? Make sure you"ve gone into the "installation" menu and set your zip code under "local networks". In looking at mine, it appears DirecTV is adding 4 out of 6. They are not adding CBS and NBC (12-1 and 3-1).
The one complaint I have with the TS-160 is initially tuning local channels. If they are not added by the DirecTV guide (local networks), then it's tough sometimes to get the locked into the guide.
The only way to add another OTA channel to the guide is to either manually tune AND sync a channel (meaning you enter 3-1 on the remote and you get picture and sound) or do a digital channel scan from the "antenna and cable" menu.
For manual tuning, if you enter 3-1 and it goes to a snowy screen, it did not sync and 3-1 will not be saved in the guide. The receiver has to receive PSIP data from the station in order for the channel to be saved. The same is basically true for the channel scan. If the TS-160 does not find a channel, then nothing is added to the guide.
You can probably see the problem with this now. If your not receiving a channel with your current antenna setup, then there's no way to add the channel to the guide unless DirecTV is adding it (which they are not for 3-1 and 12-1 as of right now).
With all that said, my advice is to get the other 4 channels working first (10-1, 24-1, 33-1, and 36-1). You should be able to get those as I get high signal strength on all 4 of them. Make sure you have a good coax cable connecting the Silver Sensor to your receiver and try tweaking the antenna position. You can tweak the antenna position similarly to the a satellite dish. Tune to a channel you are not getting (that's in the guide) and go to the signal strength meter in the setup menu. Then start moving the antenna around slowly until you maximize the signal strength.
Let me know what progress your making. I'm in the middle of moving right now (finally getting out of this apartment and into a house, woohoo!), but when I get settled I would be willing to give you more help.
One thing that we could do is hook your receiver to my antenna and do a channel scan. Assuming I'm getting them all, then that would lock all of the channels into the guide making it easier to tweak, but that will have to wait a while until I finish moving and get my stuff working again.
Anyway, this may make things sound bad for the TS-160, but it does work great once you get past the OTA tuning problems. The constant S-video out is nice, that's for sure.