Rohn 20/25 - 30 Foot Vertical Antenna 
40 / 20 / 15 / 10 Meters 
Designed by Ben KE4TFI 
 
Pictures of Antenna 
One of the planned Antennas to construct at the Nixon Chapel Antenna Party 
 
1. Attach ground radials to ground rod at ground level. 
2. Set base over ground rod and radials. 
3. Anchor radials at far end with 120-degree spacing. 
4. Attach guys and the (2 sloping wires) to top of tower. 
5. Raise tower and anchor guys at end of radials. 
6. Attach the sloping wires to the end of the radials. 
7. Connect the shield of the feed line to the ground rod. 
8. Connect the center conductor of feed line to all 3 legs using as short a length of wire as possible.  
9. The wires from the tower legs will form a star with the coax center conductor connected at the center
 
3D View of Antenna made from 3 sections of Rohn 20/25 
 
 
Base to isolate the Tower from ground 
 
 
Far Field Plots 
 
Calculation Table 
 
 
Click here for a copy of the MMANA Antenna program 
Click here to download the data file for this antenna 
 
 
Webpage designed by KC0ONR 
MCARS 
Marshall County Alabama Repeater Systems