I found antennaweb is useless. The info they give you is not even remotely accurate, at least for my area.
You can’t get most of the stations, 'cause they are basing things on cirucular data which isn’t always the case. Most digital stations don’t broadcast their signals in circles but use directions.
First of all, digital TV is mostly UHF. So you need a UHF antenna. Rabbit ears are VHF antennas. The circle in the middle of an antenna or the “bow” that attches to the “rabbit ear” part is the UHF antenna. A “silver sensor” antenna is optimized for UHF.
Stations that are analog now broadcast on virtual channels. For instance in Chicago, WLS-TV Channel 7 broadcasts digitally on channel 52. So you need a UHF antenna to get it. After analog shuts down, WLS-TV will return to Channel 7, because Channels 52 -69 will be taken away from TV and given to other services like cell phones and wireless internet.
You don’t see this because a service called PSIP allows virtual channels. So if you tune to channel 52 it goes automatically to Channel 7. That way TV stations won’t have to rebrand
Digital stations aren’t always able to replicate their analog areas, because their channels are different and there is interference between analog and digital right now. This should get better after analog shuts down.
Unlike analog where two TV channels can’t be next to each other digital TV channels CAN be next to each other providing their transmitters are at the same antenna site. (For those who wonder, Channels 4 and 5 aren’t actually next to each other, there are other frequencies between them. And Channels 6 and 7 aren’t really next to each other, for example the FM radio band occupies a large portion between channel 6 and channel 7. And of course channels 13 and 14 aren’t next to each other, channel 13 being VHF and channel 14 being UHF).
In Chicago I went from16 analog TV stations to ZERO digital TV stations and had to get back cable to get TV. I am only 3 miles NW of Sears Tower where the transmitters are, so often buildings and such in high density areas like NYC and Chicago cause issues that don’t happen with analog.
Rabbit Ears (dot) Info has a lot of technical information about TV stations and is run by a kid who loves to talk about TV. So if you ask him a question he’ll give you the answer and a LOT more.
Also you might want to try AVS Forums, the site desgin is kind of busy but look around for the forums for OTA (Over the air) and your city to see if anyone else is having specific problems.