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Hello and welcome!
Here are a few thoughts:
1) Is it the same TV tested at each of the locations in the house? If not, each make/model of TV might have a different tuner design that can make it perform better/worse under different situations (i.e., different levels of multipath, signal-to-noise ratio, interference, etc.). If different TVs were used in the tests, also make sure that each one is properly set up for "Air" TV as opposed to "cable" TV, if the menus allow for such an option.
2) Is there any interference getting into the cable? RG59 coax is thin and poorly shielded. RG6 is thicker and has better shielding. RG6Q (quad shield) has even more shielding and is even more resistant to signal ingress. If the coax runs parallel to a lot of electrical wiring or goes near "noisy" electrical equipment (e.g., vacuum cleaners, microwave ovens, etc.), it might be picking up interference which can make reception more difficult.
3) Make sure that there are no kinks (sharp bends), cuts, shorts (between center and outer conductors), or crushed portions of the cable. You may want to do a continuity test to make sure everything is as it should be. If both ends of the cable are left open (not connected to anything), then you should read an open circuit (infinite resistance between center conductor and outer shield) from either end of the cable. If you then short one end (connect center conductor to outer shield), you should be able to read a closed circuit (low resistance) from the other end of the cable.
4) Test without the coax distribution network first (I'm assuming you mean the same coax that was used to distribute cable TV throughout the house). Are you sure that there is no signal still coming from the cable company's signal feed? Cable TV and OTA TV cover many of the same frequencies, so if the system is still hooked up to the cable company in any way, there might be two sets of signals interfering with each other. If you want to use the pre-existing cable, you must make sure that the network is completely disconnected from the cable company's feed into your house. You may even want to put a terminator on the cable company's feed just to make sure there's no "signal leakage" that might be picked up elsewhere.
5) Assuming that you're able to figure out how to get reliable reception from your antenna feed, when you get around to testing the cable distribution network, there are a few things to check... a) See if there are any distribution amplifiers in the setup and, if there are any, make sure you're sending your antenna feed into the right port. b) If there are any unused ports on the network (i.e., unused ports on splitters, open-ended cables in any of the rooms, etc.), I recommend that you put 75-ohm terminators on them to prevent any signal reflection back into the cable network.
If you're testing with the same TV or set-top box in each location, have you tried comparing the signal quality readings (usually available in the menus of most receivers) from each location? The exact scale of these signal quality meters is usually set arbitrarily, but it might give you a clue as to whether you're up against a gradual degradation of the signal from one room to the next, or if you're dealing with a more severe signal drop of some kind (e.g., a short in one of the connectors).
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