MASC supports antennas mounted at masts as well as antennas mounted in front of walls:

Figure 1. The Definition of local environment dialog.
The following configurations are supported:
  • Quasi-omni (mast configuration)
  • Skew (mast configuration)
  • Side-mounted (mast configuration)
  • Antenna in front of a wall (wall configuration)

The difference between the first three configurations (quasi-omni, skew, and side-mounted) is only the angle between arm and antenna. But as you can define these angles, each configuration can be described by the mast configuration.

The Antenna in front of a wall configuration is different as the antennas are mounted on a wall instead of a mast.