Visit these useful links refenced in the book:
www.fcc.gov/oet/fccid/ - search on the FCC ID of the radio
http://ftp.fcc.gov/oet/info/documents/bulletins/#65 – Evaluating Compliance with FCC-Specified Guidelines for Human Exposure to Radio Frequency Radiation
www.thirdheight.com/support/downloads/wireless/SOM_calcs.xls – fresnel zone clearance
www.smallnetbuilder.com/Reviews-38-ProdID-WSB24-1.php – signal amplification