Tiltxt Pattern File Format (created 1998-05-25 updated 2003-13-06)
==========================

The azimuth and elevation patterns are stored in separate files, e.g.:

TA-2350-T4.az.txt
TA-2350-T4.el.txt

They consist of 2 title lines, 1 blank line, 1 column heading line,
followed by 2 columns representing angle in degrees and relative gain. A
partial sample is shown below:

-----
TA-2350-T4
Elevation Pattern

 Angle  Relative Gain (dB)
-180.0   -39.8
-179.0   -35.7
:
178.0    -27.3
179.0    -33.2
180.0    -39.8
-----

The maximum relative gain is 0 dB.

The angles are defined as follows: With the antenna mounted vertically,
(1) the elevation pattern angles are such that from the antenna, 0
degrees is upward, and 90 degrees is frontward, and (2) the azimuth
pattern angles are such that 0 degrees is frontward and 90 degrees is
leftward. For antennas with downtilt, the azimuth pattern is at the
downtilt angle. However, in most cases there is no significant
difference between that and the azimuth pattern in the horizontal plane.

For antennas that may be mounted for either vertical (VPOL) or
horizontal (HPOL) polarization (termed "directional" antennas in the
TIL-TEK catalogue), the patterns are for the antenna mounted to produce
vertical polarization. In such cases, the HPOL patterns can be obtained
from the VPOL ones by interchanging the azimuth and elevation patterns.