- 5 -
3. Slide the 2" OD element that has the EXTREN
®
insulators installed in the U-Bolts as shown
below. Adjust the EXTREN
®
insulators so they are centered on the U-Bolts. Tighten the U-
Bolts evenly so the length of the exposed threads is approximately equal. Any U-Bolt should be
tightened evenly from side-to-side with an equal amount of thread above each nut.
4. Install the studded band clamp (antenna feedpoint) at the bottom of the 2" OD aluminum
element as shown below. Use a small amount of Penetrox A between the studded band clamp
and the 2" OD aluminum element.
5. Assemble the vertical sections as shown in
Figure 1
using the stainless
steel element clamps allowing a four inch overlap between the element
sections. Slide all the clamps over each section before putting them
together. You can lightly tighten the clamps just below the slits in each
section to hold them until needed. Align the clamp screws on each section
to face the same direction. At final assembly, body of the clamp should be
positioned between the slits in the tubes and 1/8" from the edge of each
tube as shown to the right. The five top element sections have an overlap of 4" to give you a
starting overall length of 412 inches. During tuning, you will make slight adjustments to get the
center frequency to where you want it.
