Often there is no difference. With wireless if you are too far from the transmitter or something that absorbs signal like a metal wall is in between antennas you may get snow in the picture (thus why I run enough power to reach across my next door neighbor's lot with decent clarity). Also if you have metal or concrete walls or someone moving within 5' of the antennas ghosting/multipath can occur...Strategic antenna placement usually will prevent or fix it.
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