Deep Drilled Braced Monument Overview

Deep Drilled Braced Monument

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Mount Commonly Used
Install Time
Site Impact

SCIGN mount


2-4 d



The deep drilled braced monument (UNAVCO DDBM*) provides for a high degree of stability and longevity and can be anchored in bedrock or unconsolidated material. It is in the form of a tripod, each leg extending into the ground up to about 40 feet and welded at the top with gusset reinforcements. If site access is an issue and bedrock is available, the short drilled braced monument is the next best alternative to this type. The UNAVCO DDBM is used throughout the PBO network.  It is based on the SCIGN design used at older installations in the SCIGN, BARGEN, PBO and PANGA networks.

* Modified from the original SCIGN DDBM design of Duncan Agnew and Frank Wyatt.

Site ASHM of the BARGEN network, Nevada, Utah, and California.



Design and Construction

A drilling contractor is required to install this monument. The cost of installation depends upon factors such as the type of drilling rig used, distance the drill rig and crew need to travel to site (mobilization/de-mobilization), foundation material (ground) being drilled, etc.


Installation Photos

Approximate Cost

Depends principally on drilling (substrate, distance drill rig needs to travel to and from the site)

This cost is for the monumentation only; the antenna mount (e.g. SCIGN mount) is not included.



Mount Commonly Used

The SCIGN mount is the antenna mount most commonly used with the deep drilled braced monument, although it is only required when using the SCIGN radome. Otherwise, any other leveling mount, such as the SECO 2072-series antenna mount, is acceptable.


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Article ID: 300
Created: October 26, 2011
Last Updated: February 4, 2022
Author: Beth Bartel

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