SXT and Sextant Transmit power

hi
i want know How far SXT and Sextant devices can i use?
if i use SXT5HnD for PtP, how much bandwidth can i have for 3 Km distance?
what is the best configuration for SXT PtP Link for 3 Km distance?

3 Km is no problem for a link with sxt but you must have a los (line of sight)

a example and basis config see you here
http://www.wirelessinfo.be/index.php/mikrotik/pages/omnitikpp

whats about 7km distance and sextant device?

This is attainable with a perfect los