Wifi Coverage

Access Point

http://www.edimax.co.uk/en/support_detail.php?pd_id=19&pl1_id=1&pl2_id=5

Antenna Antenna Gain

http://dx.com/p/liehuo-14db-2-4ghz-14dbi-wi-fi-directional-antenna-white-147713

Coverage of School Playing fields

Info : Power of Access Point 18dbm

Typical Noise -90dBm

-60dBm typical good signal

 

 

http://en.wikipedia.org/wiki/Friis_transmission_equation