What if your range requirement is 20km? 40km? Consider this Product, with an appropriate high gain antenna. The range achieved by these modems reduces under non-Line Of Sight (LOS) conditions, but may still be the difference between reliable and unreliable communication. Furthermore, these have a receive sensitivity of -104 dBm.

Features and Benefits:

Plug and communicate (no configuration required).

True peer to peer networking.

Transparent operation supports existing system and software.

Simple configuration using AT commands.

Choice of RS232 or RS485/422 (multi-drop bus) protocol support or optical interface or ethernet 
   interface.

Indoor range up to 400m, outdoor range up to 20Km  in line of sight condition.

LED indicators for Power Tx and Rx.

Specifications:

General

Frequency Range	2.4GHz ISM band (license free)
RF baud rate	250kbps
Grade	Commercial or Industrial
Power supply	9 to 24V, 600mA DC
Host interface serial baud rate	1200-1,15,200
Host interface	RS232/RS485/RS422/Optical/Ethernet interface
RPSMA connector	RPSMA Connector at RF interface
Type of modem	Direct Sequence Spread Spectrum

Maximum Range obtained by the modem