Sierra Wireless MP215 - Manual (Page 20)

MP215 Mobile Modem Installation, Configuration, and User’s Guide
Sierra Wireless Inc. 05/11/99 3-6
If the cable loss between the modem and antenna is greater then 2 dB, it is
acceptable to use a 3 dB gain antenna as the ERP will be within the 36 dBm +2/-4
dB limit. 2dB loss results when using approximately 15 feet or RG-58 co-axial
cable.
The antenna should be mounted well away from any objects that may ‘shield’ it
from receiving signals. A roof top location is best. The antenna location may be
adjusted based on experimentation, using the RSSI reading displayed by the
Watcher application.