This document provides installation instructions for the Honeywell GSM-ANT indoor antenna. It explains that the internal antenna on the 7845GSM and 7845i-GSM modules may not always provide a strong enough signal and an external antenna can improve reception. It describes how to check the signal strength and select a location with at least 3 bars, then connect and mount the external antenna vertically while maintaining clearance from large metal objects to maximize signal strength. Specifications of the GSM-ANT antenna are also listed.