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As was stated, the size of the cable won't make a difference in video quality unless you live a very long distance from the tap. They typically use RG6 from the tap to your house, but if they used RG59 I would suggest you have them switch it out for RG6. Find out what type of shielding they use in the cable, make sure they are using a quad shielded cable. This will help with interference. Ask them if they can use RG11 quad shield, but I'm sure they will say no and besides it won't give you much better video quality. However, nothing is stopping you from buying better quality cable yourself and giving it to them to install. The F-connectors used on RG11 are different than RG6, are harder to find, and require a different tool to crimp onto the cable.
What will make the difference in quality is the level of RF signal in your house. Make sure they check the levels, preferably at your TV or cable box location, watch them do it, and then demand they make them right if the levels are off. You want the levels to be at 0db(zero decibels) +/- 3db (maybe +/- 5). The best quality cable with no splitters anywhere on the line won’t make up for a bad signal level! In fact, it doesn't matter how many splitters you have on the line as long as the levels are good. If the signal is higher or lower than zero, you could see problems like macro blocking on digital channels or snow on analog. If the levels are below 0db, and they can't get the signal level to zero, you can buy a RF amp. If you do get a RF amp, make sure it is a two-way.
In a nut shell, use quad shielded RG6 and make sure your signal level is at zero.
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