To know for sure you must create a path profile and use YT software to tell you
the answer. In some cases the profile matters as much as a mile away.
YT was written by N6BV and is distributed with the ARRL Antenna Handbook.
73, Fred K2TR
k4gun@comcast.net wrote:or instance, several of the places from which I
transmitted in the last contest were close to drops. Look at a bridge. While
the antenna may be 13' above the road on which the truck is parked, the truck
may be 20' from a ledge that drops an additional 20'. When modeling the
antenna would you use the 13' or the 33'? How close or far from a drop could
you be to take this into account?
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