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« on: July 06, 2014, 1714 UTC »
Every section of your antenna that is inside your house can pick up interference from inside devices. That's why it is common to use coax between the radio and the start of the antenna. While some sort of a matching transformer (such as a unun) may be ideal where the coax and antenna meet, they aren't required, and many listeners do fine without one. Just connect the antenna wire to the coax center conductor. Some weather proofing would be a good idea, so water doesn't get inside the coax. Some advocate grounding the coax shield at the antenna, others say leave it open.
Note that you should have a lightning arrestor or other protection device for any outside antenna, which should be grounded, for safety. Personally, I take the extra step of disconnecting antennas when storms are likely. The NEC (National Electric Code) has a section on dealing with antennas and transmission lines, IIRC, which you may want to consult.