A method for determining coverage gaps within a geographical area served by a wireless communication network includes: (a) receiving a location report from each of a plurality of mobile units; (b) storing all location reports received from the mobile units in a database; and (c) searching the database for a position within the geographical area at which an acceptable quality wireless signal has not been received. The location report may include a measured signal quality metric of the wireless link, which may be the signal strength of the wireless link, a bit error rate of the wireless link, or both. Location reports may be displayed on a map to show coverage quality and gaps. Statistical technique and quantitative techniques can be applied on the signal quality metrics reported.