Note: This antenna design was taken from PacketRadio.com and slightly modified.  The 6 meter measurements were used.

Where the shield and center conductor are usually attach to the tuning stub and the driven element with aerosol (hose) clamps, there's a slight change in the design by exchanging the elbow for a tee.  Below the short (1/4 wave tuning stub) section, I attached an SO-239 (Chassis-mount) coax (female) connector. But notice that we must first attach a piece of number 10 or 12 insulated, copper wire to the SO-239.  The length of this wire depends on the spacing between the stub and (Fig 2 "D") long section of our antenna. 

For a six meter antenna the wire length was about 12 inches long.  After soldering the wire to the center connector, a piece of shrink tubing was used to cover the soldered area to seal against moisture.  To attach the SO-239 to the copper tee, I fed two sections of #12 gauge copper wire through the holes in the base of the SO-239 in a square "U" shape (Fig 3) on each side of the base and with the excess wire extending up the copper tee, I used a hose clamp to secure it to the "T".  This way it made a solid connection and I did not have to worry about melting the center wire or nylon insulator in the connector.  The other end of the wire was attached to the driven element with a crimp on spade terminal and self taping screw.  The terminal and wire were also covered with shrink tubing to protect from moisture.

For 2 meters (145.000 to 146.000 MHz) the EXACT dimensions are:

A =  58 inches overall (Long, driven element).
B =  19.5 Inches
C =  2 Inches
D =  1.8 Inches (space)

For 220 MHz (222.000 to 225.000 MHz) the EXACT dimensions are:

A =  37.8 inches overall (Long, driven element).
B =  12.6 Inches
C =  1.2 Inches
D =  1.2 Inches (space)

For 6 meters (50.500 to 51.500 MHz) the EXACT dimensions are:

A =  166-3/4 inches overall (long, driven element).
B =  58-3/4 inches (short, tuning stub).
C =  5.5 Inches
D =  5 inches


 Figure 1

 


Figure 2

 

A Hose clamp was used to attach the copper wire (in red) to the "T"

            
Figure 3