The National Weather Service estimates a range of approximately 40 miles around their stations. Thus, it may be feasible to receive the displayed station anywhere on the coverage map. Said otherwise, if you are trying to receive a station from a location not on the map, you probably won't be successful. Clicking on 162.550 produces a wide-area map extending into Pennsylvania to the west, all of Long Island and most of Connecticut to the east, most of the way to Albany to the north and Atlantic City and Philadelphia to the south. Clicking on KWO35 produces a regional map just covering parts of New York, New Jersey and Connecticut.
Most data comes from the NOAA list, nwsli.list.
For stations not in this list, the geographic location for the listed city was obtained from the US Census Bureau's Tiger Mapping Service. At this rate, all states should be done by the end of 1998. Individual stations may be added sooner as corrections and updates are made. The development of how the maps are rendered is on-going. As a result, the appearance of the same map from week to week might change.