TY - RPRT TI - Measurements to support public safety communications : attenuation and variability of 750 MHz radio wave signals in four large building structures AU - Camell, D G AU - Floris, Sander AU - Garuti, Andrea AU - Grosvenor, Chriss A AU - Holloway, Christopher L AU - Koepke, Galen H AU - Ladbury, John M AU - Numan, Wouter AU - Remley, Kate A AU - Young, William F PY - 2009 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS TN 1552 DO - 10.6028/NIST.TN.1552 ER -