We report on an implementation of a Radio over Fiber system based on IEEE 802.15.4 standard in a geographically distributed optical network. The system performance was analyzed under real conditions of temperature, pressure, humidity, and wind. Experimental results show no signal degradation and indicate frame error rates two orders of magnitude below the typical levels of wireless sensor networks. for distances tip to 160 kin. (C) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1876-1879, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.2449751818761879