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A 4-bay antenna is actually four receiving elements ganged together to improve gain, receiving pattern or both. There is a reflector placed behind the active elements.
Examples of 4-bay antennas are:
Antennacraft U4000
Antennas Direct CS4, DB4 and newer DB4e
Channel Master CM-4221
Most 4-bay designs stack the elements Vertically to focus on the the horizon (to make the antenna less sensitive at angles above and below the horizon). These antennas generally have a wide pattern horizontally (stations to the left and right of the point of aim are still in the antennas 'view'). The CS4 is an exception, by stacking two pairs side by side, the antenna has a narrower view in the horizontal plane while having a bit more sensitivity to signals bouncing from upper layers of the atmosphere.
A Yagi antenna generally has one receiving element aided by a reflector and one or more director elements. The longer the antenna, the more directors, the higher the gain and the narrower the receiving pattern.
Examples of UHF Yagi designs:
Antennacraft MXU47 & MXU59
Antennas Direct SR8, SR15, 42XG, 43XG & 91XG
Channel Master CM3022, CM3023
Winegard HD9022, HD9032, HD9075P & HD9095P
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