Broadcast Technical Consultants

Serving you since 1994

Land Requirements

Use this formula to determine the approximate amount of land required for a standard guyed FM tower.




L = 1.75 (A) + 30 Feet

W = 1.5 (A) + 30 Feet

A = Anchor Distance - The typical anchor distance "A" for

a standard guyed tower is normally assumed at 80% of the

tower height.
(Tower height X 0.8 = A)

1 Acre = 43,560 Square Feet


Calculate the amount of ballast needed for a non-penetrating roof mount.



W = Required ballast per tray (three trays per mount) in pounds

P = Wind load of antenna(s) in pounds

H  = Distance from center of antenna to roof surface

W = 0.19 (P) (H) - 135

Total Ballast Needed = W (3)

Or use the online form below:


Please note, this is for estimating purposes ONLY!  Graham Brock, Inc. assumes no liability or assurances of the information provided below.  Please contact the manufacturer of your Tower mount for exact figures.  This is to be used only as a guide.

Ohms law

Ohms Law is a mathematical equation that shows the relationship between Voltage, Current and Resistance in an electrical circuit. It is stated as:

V = I x R

R = V / I

I  = V / R


V = V

I  = Current  (I stands for INTENSITY)

R = R

Formulas & Conversions