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As for the preamp suggested. Can that be put in the basement or does it have to mounted to the mast with the antenna?
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The closer it is to the antenna, the better. The signals should be amplified before they encounter the coax loss. The amp cannot recreate a weak signal once it is lost. Also, the total system noise figure is best improved by the preamp when close to the antenna, which benefits the weakest signals. However, you are welcome to try it down below; I understand your desire to avoid having to go up there any more than necessary. That is not the best location because you would lose half the signal (3 dB). The attenuation factor for RG6 is about 6 dB per 100 feet for UHF.
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I have coax run in the house where I want my TV's and they all come together in the basement. Should I use the channel Master CM3414 4-Port Distribution Amplifier for Cable and Antenna Signal with it as a splitter or should I get an unamplified splitter.
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I suggest the preamp near the antenna and one TV below for a test. Then, add a passive 4-way splitter for more TVs. If there isn't enough signal, replace the splitter with a 3414.
DO NOT combine cable and OTA signals. It might cause cable signals to be radiated by your antenna system, which is illegal. The FCC has strict limits for radiation by cable systems because some channels are in the aircraft band.
https://www.google.com/?gws_rd=ssl#q...+system+egress
https://www.fcc.gov/guides/cable-signal-leakage
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The image you posted was close. My house is actually the one hidden by the (+) sign in the top left of the image.
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Thanks for telling me; I rarely get to find out how close my guess was because this site tries to protect the identity of users.