Best outdoor antenna???

Just picked up a Kenwood KT-917 and being that this is my first tuner ever, I am a bit in the dark here looking for a good antenna that could pick up stations located at two opposite directions. I live 10 miles outside of San Antonio,Tx. with Austin 80 miles on the opposite direction with great stations I prefer to ones in San Antonio. I have tried doing some research on antennas and thought of the "Yogi" but they are supposed to be very directional and rejects other stations except ones in it's pointed direction. Does this mean I will not hear the stations in my own city if I directed it towards Austin? If not the "yagi", then what is your suggestion?

One more question, Is it better to use the twin lead 300 ohm
connection or the 75 ohm single lead coaxial? I would truly
appreciate any input on these issues I can get from those of
you with the experience.

John