Dirty little secret. Many antenna companies will lie about their reception range. There is no way an indoor antenna will pick up 80 miles. A good outdoor antenna 30 feet above the ground will not reach over 70 miles.
Also, there are three frequency bands on which station broadcast: Low VHF (2-6), High VHF (7-13), UHF (14+). Many indoor and outdoor antennae are simply UHF, but you can find combination antennae. Additionally, many stations, as part of the channel repacks, actually moved their true radio frequency, but still identify as the old frequency.
WMAR channel 2 is actually broadcasting on channel 27 (UHF).
WJZ channel 13 is actually broadcasting on channel 11 (High VHF)
WBAL channel 11 is actually broadcasting on channel 12 (High VHF)
None in your area actually broadcast on their commonly known channels (virtual channels) but their true channels are all either UHF or High VHF. If you antenna doesn't pick up High VHF, you won't get good signal from those stations.
Most of the towers are in Woodbury, so that's the location from which you must measure distance.
Here are a couple of Websites that will help you determine what to expect.
And none will give you a straight answer, because of the number of factors involved, including but not limited to height, distance, obstacles, house wiring, and many many other things.
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