[John Candle]

The thing about omnidirectional antennas is that they Do Not reject multipath / reflected signals , and you are in a Very High multipath situation. Do not use a nondirectional preamp/amplified antenna it will amplify the multipath and make the reception even worse. At receive situations where the transmitters are on top of a mountain , and the receiving antenna is close to the mountain , and the reception is blocked by that same mountain , repeater/translators are often put a distance away so that antennas can receive the main transmitters via~ the repeater/translator. Highly Directional antennas are the best to use in high multipath situations.