The distance you hear a station from is dependent on many factors - the height of the transmit antenna, your antenna's height, the power output, the frequency, the coax you are using (plays into how much signal you lose) all play a role. What freq range(s) are you looking to rebroadcast? Can you put something outside? Can you get it clear of surrounding objects? A little more specifics is in order...
Discones are the usual way most people go, but let's get a better idea of what is going on here..Mike