You're only a half-mile from one station (low-power, but still...) and pretty close to channel 10, so it is very likely any kind of amplifier will end up overloaded. A lower-gain antenna that covers high-VHF and UHF channels is the RCA ANT-751. You can mount this outside (avoiding up to 20 dB of loss through the walls) and run the cable to a 4-way splitter inside. You should have plenty of signal left for all the TVs, but now you know how to do the system design to be sure.
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