MORE ABOUT NVIS:
NVIS allows stations to more effectively work each other in the 30-300 mile
range. But another “fringe benefit” of NVIS is that, stations beyond
the desired distance won’t hear you. In a net however, it only takes one
station using a vertical antenna or excessive power to cause a “problem” by
being heard beyond the desired range. The end result may be that that
station may be asked to “listen out”, or the NCS may have to move the net to
different frequency. Many EMCOMM hams use a vertical antenna, (that may be
all they have available) and can still be heard well in a regional net...but
they may (underscore MAY) be heard beyond the net’s service area and cause QRM
to another net or QSO. If a distant station complains, reducing power or
minimizing transmissions may help.