Substantial effort has been made to employ wireless sensor network and Internet technologies for environmental and habitat protection. Several monitoring systems are designed to collect data regarding temperature, humidity, pressure and some other environmental parameters, amongst which recently there is the exposure to electromagnetic field. In this paper, some basic features of the multiband sensors that are incorporated into the Serbian electromagnetic field monitoring network - SEMONT are presented. The SEMONT information network is designed and aimed for the remote, long-term, 24 hours a day, permanent broadband monitoring of the electromagnetic field in the environment. [Projekat Ministarstva nauke Republike Srbije, br. TR 32055]