Coverage Patterns of 802.11n and is this consistent?

The coverage patterns of 802.11a/b/g are mainly limited by attenuation and shadowing and are reletively predicitable. 802.1a/b/g specified a number of data rates and operating modes. The available data rates of a 802.11n MIMO link are dependent on the local scattering environment – for example, a low angular spread at the receiver results in a low proability of achieving multiple uncorrelated spatial channels – and also the number of possible data rates and modes is much larger.  Thus the coverage pattern of an 802.11n AP is much more nebulous and hard to quantify. The only thing that can be positively stated is that the coverage pattern of a 802.11n AP will almost certainly be larger thatn the coverage pattern of a 802.11a/g AP of the same power output and senstivity.