You've finally found the perfect
antenna design. It has fantasic gain, nice front-to-back ratio, everything
you've always wanted in an antenna. Only one problem... the design is for
the two meter band and you want to use it on the 10 meter band! What do
you do? Do you start your search all over again? No... enter the wondrous
frequency scaling!

We are very fortunate that there
is a very easy way to determine the length of an antenna for any frequency
as long as we scale all of the measurements of the original antenna
design. This means we must scale the spacing between elements, the lengths
of each of the antenna sections as well as the diameter of the antenna
itself.

This page allows you to
calculate the length for a given antenna measurement and use the results to
design your antenna on a different band. The formula for frequency scaling
is simple... ( Original design frequency / New design frequency ) * Old measurement
length

Be sure to keep the measurements all in the
same units, if the original frequency is in MHz the new frequency must also
be in MHz. Also if the original length is in meters, the new scaled length
will also be in meters.

Original Antenna Frequency
New Antenna Frequency
Original Length (Element, Spacing, Diameter,
Etc.)