HAAT Calculation Worksheet

This worksheet may be used to calculate your antenna's 
Height Above Average Terrain (HAAT). 

Exact Station Location:

  __44__ Degrees  __50__ Minutes __51__ Seconds  North Latitude
  __87__ Degrees  __96__ Minutes __66__ Seconds  West Longitude

Identification of topographical map used: __USGS 7.5 Min__________
1.On the topographical map, plot 8 radials at 45 degree increments,
centered on the transmitter location. Then plot 5 circles at 2-, 4-,
6-, 8-, and 10-mile radii, centered on the transmitter location. 
Determine the ground elevations at the 40 points of intersection 
of the 8 radials and 5 circles. Enter these into Table I. 

                            Table I
+--------------------------------------------------------------+
|              |                          Radial               |
|  Circle      +-----------------------------------------------+
|  Radius      |   0 |  45 |  90 | 135 | 180 | 225 | 270 | 315 |
+--------------------------------------------------------------+
|  2 miles     | 583 | 600 | 765 | 750 | 650 | 600 | 590 | 582 |
+--------------------------------------------------------------+
|  4 miles     | 583 | 646 | 788 | 780 | 650 | 589 | 600 | 584 |
+--------------------------------------------------------------+
|  6 miles     | 583 | 730 | 787 | 802 | 845 | 620 | 650 | 602 |
+--------------------------------------------------------------+
|  8 miles     | 583 | 730 | 787 | 919 | 847 | 640 | 689 | 600 |
+--------------------------------------------------------------+
| 10 miles     | 583 | 800 | 840 | 920 | 920 | 588 | 700 | 702 |
+--------------------------------------------------------------+


2.Determine antenna height above sea level:

Transmit site ground elevation:          ____660_____ feet
Add antenna height above ground:        +_____30_____ feet
Equals antenna hieght above sea level:  =____690_____ feet
  

3.Determine average ground elevation:

Add the ground elevation of all 40 points in Table I:  _27807__
Divide by 40                                            /  40
Equals average ground elevation                       =_695.2__
  

4.Now calculate antenna HAAT:

Antenna height above sea level:    __690.0__
Minus average ground elevation: -  __695.2__
Equals antenna HAAT:            =  _-__5.2__