The Baltimore stations are the easiest to receive. WBAL & WJZ are broadcast on High-VHF frequencies so I would opt for an antenna that includes support for both UHF and H-VHF reception.
Trees can cause problems with reliable reception, by reflecting and absorbing the signal. Ideally the antenna would mount outdoors, clear of all obstructions such as buildings and vegetation. Can you consider mounting higher than 20', or in a location clear of the tree?
Consider the Winegard HD7698P antenna pointed at Baltimore (about 333° compass) and the Winegard HDP-269 preamp.
An alternate system that would give you access to both Baltimore and some DC stations would be an Antennas Direct DB4e UHF antenna facing about 320° and an Antennacraft Y10713 H-VHF antenna pointed at 341°. The Antennacraft 10G221 preamp has separate inputs for the UHF and VHF antennas.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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