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The main group of Tv stations are to the North East and the other group are to the West.
Put the FreeVision antenna in/at a ~North East~ facing window aim the antenna at about 54 degree magnetic compass direction.
Here is how to aim indoor and outdoor antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
If a long length of coax is required to connect the antenna that is in/at the window to the Tivo or TV , then so be it , because placing the antenna at a location that is more likely to provide reliable reception is more important then objections to the long length of coax running through the living space.
Digital Tuners can develop -Digital Glitches- that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.