There are several attachments to this page:

1. Construction Guide.
2. Specifications
3. Bad SWR diagnostic page.
4. SWR Chart (for recording SWR for diagnostic purposes)
5. Tuning the Spiderbeam

LARC Spiderbeam assembly instructions.

Before you start, remember this: This beam has been assembled before which means if something does not fit, you do NOT have it in the correct place or position. The antenna consists of the center post with balun mounted, center post extension, fiberglass spreaders and 4 spools with supports and elements.

There are several attachments to this page: 1. Construction Guide. 2. Specifications 3. Bad SWR diagnostic page. 4. SWR Chart (for recording SWR for diagnostic purposes) 5. Tuning the Spiderbeam

LARC Spiderbeam assembly instructions.

Before you start, remember this: This beam has been assembled before which means if something does not fit, you do NOT have it in the correct place or position. The antenna consists of the center post with balun mounted, center post extension, fiberglass spreaders and 4 spools with supports and elements. 1) Start with the hub and assemble the spreaders. The 2 reflector / director arms that goes into the hub has aluminum spacers and are clearly marked. The 2 side arms have no spacers, but have end-caps. Make sure all the hook rings are in place. There are hook rings on the third sections as well as the final sections. The hook rings with 4 hooks goes on the side arms and the rings with 2 hooks on the front and back. Install the mast extension above the balun. 2) Locate the spool with the mono-filament and attach the 4 mono-filament supports to the spider. This hooks onto the rings on section 3. Make sure the hook for optional kevlar lines are at the top. The tension on the mono-filament can be adjusted by moving the o-rings on the front and back booms and moving the ring hooks forwards or backwards. 3) Locate the spool with the black Kevlar rope and attach the 4 supports that run from the top of the center post to the end of the spreaders. The loops hooks onto ends and the tensioners goes on the mast above the o-ring. Make sure you have the rings on the side ends in the correct orientation – they have a top position. The lower supports are optional and can also be used to support the booms at the halfway point. 4) Now start with the reflector / director spool and install the reflectors / directors in the order they come off the spool. 5) Finally, install the driven elements in the order they come off the driven element spool. Take care when the driven elements are attached to the balun that no feed line is twisted. (See the attached doc “Why is my Spiderbeam SWR bad”) The attachment points for the bands are marked on the balun. 6) Attach your coax feed line and mount the beam on the mast. Tighten the hose clamp and bottom supports (if installed). Dismantling the beam. 1) Remove the driven elements in the following order: 10, 12, 17, 20 and 15 and roll onto the spool in that order. 2) Remove the reflector and directors in the following order: 20R, 20D, 17R, 10D2, 15D, 15R, 10D1, 12R 3) Remove the Kevlar supports. 4) Remove the mono filament and disassemble the spreaders.