Working on a frequency plan for a WiFi deployment. Stars are main channels, dots indicate channel width. 1A, 1B, 38 and 40 are building numbers. Dark green is cellar, green is ground level, cyan is one level up, dark cyan is two levels up. Building 1A, 1B and 38 are next to each other, building 40 is behind building 38. The goal is to minimise channel overlap in adjacent locations.