I wanted to compare WiFi coverage of two different wireless access points and their various configurations in my house, and also check for dead spots.  One quick and cheap way to do this that I have come across is using a free product called Ekahau HeatMapper.

Ekahau HeatMapper allows you to walk around your home or office and capture information about WiFi signals in various spots, and then the software aggregates this information into a banded topographical map.

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