@David-TP thanks for your reply. The specifications listed for this produce suggest somewhat less than 10m. If you take the coverage and calculate the radius for the specified coverage area it comes...

I am looking for a unit which can deliver a 20m radius (1260 sq m of coverage). Outdoors preferably. (I note that the one outdoor unit only covers 230 sq m). I have a trio of M9's at present. Would...