I'm making my first attempt to setup an antenna to get OTA HD channels. I'm in Milton and I've installed a 4-bay Electronic Master antenna (looks like this: ) on the side of my house... which kinda faces somewhere between the CN Tower and the 401. I did my first channel scan and it found 14 channels. Should I expect more?? I haven't installed a preamp - will that help? Should I opt for a better antenna?