2.4 Ghz with 24 Dbi antenna range to smartphone?

I need to provide WiFi to a location about 1050 ft away.

• Clear line of sight
• No RF noise
• Only one or two users who need to use Skype

Idea is to use a Ubiquity outdoor AP combined to a 24Dbi directional antenna in order to boost the signal. Both transmit and most importantly receive the weak signal from a smartphone...