  Nodes are randomly distributed within an annulus (and then a shell) to form a
point pattern of communication terminals which are linked stochastically
according to the Rayleigh fading of radio-frequency data signals. We then
present analytic formulas for the connection probability of these spatially
embedded graphs, describing the connectivity behaviour as a dense-network limit
is approached. This extends recent work modelling ad hoc networks in non-convex
domains.
