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Amplifiers, if unneeded, will either cause new problems (overload and distortion) or will if they do no harm to reception, at least waste power and money. You simply do not need one, your signals are already very strong and signal power is the primary thing that an amp can affect.
Omnidirectional antennas sound like a good idea, but they're generally been demonstrated to be heavily prone to multi-path interference which is among the worst problems with our digital broadcasting system. Sometimes, they work okay, but, in general, a moderately directional antenna is able to offer much more stable reception.
All of your main TV stations are due east of you. The other stations shown on your chart are ION, which should be received off the back of a typical combo antenna if the path is adequate, CW to the south is duplicated on one of the main stations, the rest are a mix of religious or phantom (not built) stations.
Sadly, the local store's associate appears to be ill-informed about what's needed as far as amplifiers and antennas.
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