You can install 1400 or 1310 wireless bridges. 1400 is a 5Ghz wireless bridge while 1310 is a 2.4Ghz wireless bridge. The range of 1310 and 1400 wireless bridges depend on a number of factors. Please go to the following URL to calculate the range:
http://www.cisco.com/application/vnd.ms-excel/en/us/guest/products/ps458/c1225/ccmigration_09186a00800a912a.xls
Different countries have different regulation on the spectrum. 900Mhz, 2.4Ghz, and 5.8Ghz are open to public. 2.4Ghz is heavily used in US. Most new cordless phones in US use 2.4Ghz. Please find out the utilization of the channels in your area. If you pick a wireless bridge in a congested channel, there is not much you can do.
