The channels that are show as the "extra ones" could be nothing but carriers. The stations may be running nothing but black on them till the conversion. Then on conversion date they will do a hot switch from their analog to the digital. If the carrier is there then unit will show that it has found it but it can't be saved since it isn't really a channel yet. Also you have already done a search using the rabbit ears site and it is telling you what is avalibale now and that is 4. You could also look at TVfool as well to see what it says but I think that the other 2 are not available yet or too weak.