Yagi's should be used with a rotor, however they are not as effective at reducing signals from the rear as they are from the side, therefor if your two favorite stations are 180 degrees apart you can point it at the furthest one and you may get a usable signal from the other. With San Antonio only 10 miles away you should be able to do this easily. But get a big Yagi (lots of elements). Use the 75ohm coax - it's more immune to interference and can be routed anywhere/way. Using an Omni not only doesn't sufficiently amplify distant signals, it can cause multipath problems (in some areas). Have fun.........