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I agree, quad-shield coax is not going to reduce loss or improve signal to noise ratio. If you find the cable and connectors at the same price or better than standard RG-6, fine, just don't expect any significant measurable differences.
FWIW, quad-shield is ideal for closed system applications that need extra shielding. Satellite systems are an example; The losses though RG-6 at the frequencies used between the satellite and receiving dish are very high so the LNB at the dish converts the satellite band frequencies down to a range that the RG6 can transport without excessive loss. Between the LNB at the dish and the receiver, they use frequencies that are also used for terrestrial services. The extra shielding prevents the two systems from interfering with each other.
An over the air antenna operates at even lower frequencies, so loss is even less an issue. The extra shielding of quad is of no value because the antenna is directly coupled to the coax. This is an open system where the antenna is intentionally coupling signal from the air into the coax... a few nano-watts of leakage through the shield is not going to interfere with reception and there's no other system or service sharing the frequency.
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