Your signals show very strong signals. While window mount antennas are not the greatest, I'm surprised that you did not receive more channels. Did the window you tried have metal screens?
A rooftop antenna should do fine. Probably an RCA ANT-751. You have channels in several directions, so experimenting is needed depending on what you want. Aiming at either 346 or 150 degrees should get you the stations in both directions. But I'd be tempted to also try aiming at the various stations towards the northeast and southeast to see what you get.
That said, with signal levels so strong I'd probably pick up a simple table top antenna at Walmart or a local store that stocks antennas (one with a good return policy) and try it. Unless your house is wrapped in metal (aluminum siding or stucco).
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