Some more experimentation results...
All the following tests were done with a single sensor - which for comparison has a 'bare' open-air non-reflected range of 10m.
The dish arrangement shown in the left of the first picture gave about 25m range with about 2 to 3m beam width.
![Image](http://www.electroguard.eu//workshop/radar/d11.jpg)
Mounting the sensor further out towards a perceived focal point, as shown on the right, actually reduced range by a couple of meters but gave a wider 4 or 5m beam width.
Grounding the electronics to the dish seemed to improve range slightly (about 1m).
![Image](http://www.electroguard.eu//workshop/radar/d22.jpg)
Closing up the dish petals like an iris narrowed the beam greatly (to 1m) and reduced range to about 12m.
![Image](http://www.electroguard.eu//workshop/radar/d33.jpg)
Mounting the sensor inside a shortish flat-ended metal cylinder gave a range of about 15m with a beam width of 2 or 3m.
Mounting the sensor on a flat reflector gave a forward range of at least 15m with a very wide fan-shaped detection beam about as wide as long (which is nackering to map out, I might add).