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Would like to hook up 1 antenna to service all 4 TV's. Is this possible using the existing coaxial cable?
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Yes, but....
Since you are planning on keeping internet service, that means that part of the existing coaxial cable MUST remain solely dedicated to that signal coming from Comcast. You cannot "share" any section of coax between the cable-provided signal and antenna signals as they use overlapping frequencies and there will be interference between the two. Therefore, you need to segregate off that cable-specific part of the cabling and ensure that the type types of signals stay on separate coax cables.
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Have vinyl sided house that faces West. 1 story house with bonus room above garage. Attic accessible through door in bonus room.
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The biggest "gotcha" in antenna installs, after antenna selection, is the mounting site selection. If the immediate signal path in front of the antenna includes obstacles such as a taller home or trees, reliable reception forecasts get tossed out the window. Do whatever is possible to put the antenna where it has the best possible path for the signal to get to the antenna.