Accumulation of debris, snow, ice, wildlife, insects, and other contaminants adversely affect antennas that are mounted outdoors. An antenna comprises a housing and a removeable inflatable cover. The housing may include one or more engagement features, such as a perimeter channel into which perimeter of an opening of the covering is retained. The covering may be selectively inflated to produce a motion in the covering that displaces accumulated contaminants and discourages further accumulation. Heaters may warm air inside the covering to facilitate melting of ice. Inflation of the covering may be responsive to environmental conditions. For example, during high wind conditions, the covering may be evacuated and retained in a collapsed configuration to reduce damage.