Really nothing is. See http://www.digi.com/support/kbase/kbaseresultdetl?id=2051
to be precise , which equipment can be installed?
What I am saying is that NO product can provide you a 1.5km distance under Non LOS conditions. You will have to have RF LOS conditions in order to achieve that distance.
thanks for previous suggestion… LOS can be maintained so i bought xbee 15 mile coverage model… now the problem which antenna will be suitable for it