I recommend , for improved power supply transfer of power from the power supply out to the preamp and improved Tv signal from the preamp to the Tv.
Use RG-6 quadshield , with solid copper center conductor (not copper covered steal).
A continues run of coax from the power supply to the preamp.
http://www.solidsignal.com.
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Here are Ultra Low Noise Amplifiers.
http://www.kitztech.com.
http://www.researchcomms.com/hdtv.html.