Both full-power FM and Translator stations can move closer to LPFMs, than LPFMs can move toward those stations, resulting in the LPFM being "short spaced" -- possibly receiving interference or in the worst case the LPFM must shut down. We call this situation "encroachment" and this graphic is one view of historical encroachment.
It is probably the most important question to programmers, listeners,
volunteers, staff, funders, and licensees. LPFM Radio Impact Maps
are understandable, professionally styled FM radio coverage maps
with state-of-industry prediction accuracy,
population counts and demographics; designed
to be used instantly to answer questions and showcase your station.