# cell footprint You can't always place a base station wherever you want. There is a restriction on where to put base stations. AU$1000 to place a base station per year. ## Cell planning An antenna that radiates some wave. Circular? Isotropic. Directed? Important for cell planning. ## Antenna coverage contours Most of the models are wrong, but some are useful. We don't have a perfect model! Assuming a circular radiation pattern for analysis is not practical, since we can't put them edge to edge in a cellular structure.  We choose hexagonal because it gives the largest area.  Not saying in practice that cells are hexagonally shaped, but we use it for analytical purposes. Defining mathematical definition of [frequency reuse](frequency%20reuse.md). [^1] # References [^1]: