How many Nodes for a City

How many Nodes would i need to get full coverage of a City about 20 square kilometers or about 7.5 square miles

Did you try this website http://www.heywhatsthat.com/
it gives you a really good estimation of the coverage.

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that really depends on node-postion and topography.
if you have 1 router high on a televisiontower in central, this one could probably reach everywhere…
if you have urban area and the nodes are ground-floor, maybe you just have a range of 300m from node to node…

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I did, but i dont know if this site also calculates the buildings or only the terrain.
On the Countryside this maybe doesnt play to much of a role, but in i city it does i think.