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I was going to ask how wide does a unidirectional antenna can cover, but I guess it depends on the antenna, right?.
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Yagis and 8-bays typically have a -3dB beamwidth of between 15 and 45 degrees depending on the design. 4-Bays typically are between 40 and 60 degrees beamwidth. Beamwidth is a function of the directivity of the antenna, that is, how directional it is. A narrower beamwidth would tend to be the highest gain and would usually be best for either fringe signals or environments where multi-path must be controlled, ie, mountainous areas where reflected signals are a greater problem.
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If I put a reflective board behind each antenna, will it help to block behind the board signal?
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Yes. However, it might be necessary to play with the distance between the barrier and the antenna's elements to prevent unintended reflections from interfering with the reception of the desired signal(s).