How to get better range on my 2 x XBEE 900HP S3B peer-to-peer communication?

XBee & XBee Gateway
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1

I have two XBEE 900HP S3B modules with 2dBi dipole antennas on them. I have accomplished communication between them when working in my house, but I need to get communication of about 3 or 4 km (1.8 to 2.5 miles) in urban places. This cards have a maximum range of about 28 miles with LOS using high gain antennas.
So I want to know what do you recommend me to get this working on urban areas with a range of 4 km. It is possible to change the transmission power to its maximum? How much gain is “high-gain” for an antenna? What other changes must I do to get this working?
Thank you very much

2

I would suggest that you look over the following articles as it will help you to understand what you need to do.

http://knowledge.digi.com/articles/Knowledge_Base_Article/Factors-That-Affect-Range/?q=Maximizing+range&l=en_US&fs=Search&pn=1

http://knowledge.digi.com/articles/Knowledge_Base_Article/Maximizing-range/?q=Maximizing+range&l=en_US&fs=Search&pn=1

Simply put, you are going to need to obtain RF Line Of Sight before you are going to get this kind of distance.