![]() ![]() The coverage maps are shown in a single color format, which relates to an estimated signal level.Seasonal environmental conditions, such as icing or heavy rain, affect performance of a transmitter station and its various components, particularly those subject to continuous weather exposure.Because of variations in local site conditions, the performance of an individual transmitter and antenna may be less than predicted or expected.In some special instances, the antenna may have been intentionally adjusted to be "directional" and provide better coverage to a specific area to the detriment of other areas.The antenna may be affected by nearby structures or bodies of water.Placement of NWR antennas is dictated by the tower owner, which may result in a less than ideal set up.Antenna performance is a function of local conditions, causing signals to be stronger signal level in some directions than others. The computer model is sensitive to antenna performance.Coverage may be 5 to 10 percent below the computer predicted coverage for the following reasons: The coverage statistics and maps are calculated using a computer model and station data assuming ideal conditions.
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