Actually, we used a system you might be interested in. We used it to look for drug boats when no aircraft support was available.
We took a camera with a 360 degree control, mounted it underneath a weather balloon before inflating it with helium and using the cable as a "string". We could see for miles using the zoom on the camera.
I'm not saying to do it for surveillance purposes but I imagine 5 or 6 of the 12inch diameter balloons from the dollar store could get your antenna pretty high up there without all this fancy shmancy equipment.
Take that with a grain of salt and if your wife asks how you managed to run a wire over the trees to a power line 200 feet away and shock yourself, I know nothing.
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