Hello and welcome!
The PHDTV1 is a UHF-only antenna, but it won't get WJLA and WUSA because they are broadcasting on VHF channels (7 and 9).
You are very close to the transmitters, so the top channels on your list are very likely to overload any kind of amp you stick on there. I recommend that you avoid using any amps in your setup.
The best indoor antenna for your situation is the Terk HDTVi (not the amplified HDTVa version). This is very similar to the Silver Sensor except that it includes a pair of rabbit ears for VHF reception. This should perform about the same as the PHDTV1 except that it will include channels 7 and 9.
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