Further update: the supplied "rubber duck" antennas (as pictured in the earlier photo) at each end will give a video link that runs reliably over 200-300m. For 1-2km where having a video link starts to add real value, then some sort of gain antenna is needed. It is likely that there only needs to be a higher gain antenna at one end, though this will depend on how much gain the antenna is providing. I'd recommend leaving the omni-directional rubber duck at the camera/transmitter end, then the directional antenna can be adjusted easily when back at the shooting position for best picture quality.
I still think patch antennas should be a good off-the-shelf choice, just not any of the ones that look like the items referred to in the previous post. It might pay to buy in a pair just to be certain of reaching the required distance.
I did have a play myself and tried something different, ending up building a 19-element yagi. Rock-solid picture over 1km with the transmitter backed off to just 50 milliwatts![]()
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