FLI lattice tower installation by FLI rigging team

Lattice Towers

Lattice towers typically provide a more flexible solution than monopoles, allowing additional antenna capacity, greater flexibility in feeder installation and improved access to telecoms equipment. They are also easier to extend to accommodate future antennas or additional users.

FLI Structures manufactures a wide range of lattice towers, from slender single-user options to large multi-user switch structures. With 70 years of experience in lattice tower production and the acquisition of Alan Dick Towers and Masts, FLI offers the UK’s most extensive range of off-the-shelf lattice tower designs, helping to reduce development time and cost.

ATS1301 High Capacity Tower

The ATS1301 features a slim, planning-friendly profile and is designed to support 5G antennas and associated ancillary equipment. It can be used as a site-share solution, accommodating two sets of full 5G or SRN loading, and offers increased capacity compared with the ATS1300, making it suitable for exceptionally high wind-speed locations.

The tower is available in heights ranging from 15 m to 50 m in 2.5 m increments. Concrete foundation sizes are indicated on the planning drawings; however, the structure is also suitable for installation on screw pile or micropile and grillage foundation systems.

The ATS1301 includes an internal ladder, Latchway fall-arrest system, anti-climb protection, feeder brackets and lightning finials, along with a range of headframe and antenna mounting options.

CAD blocks and AR models are available on request.

ATS1301 Information & Planning Drawings.

Learn more about the benefits of using screw pile foundations.

FLI ATS 1301 high capacity lattice tower

ATS1301 Helicopter Install Variant

The ATS1301 Helicopter Variant has been developed for the SRN project.

The tower uprights connect via welded flanges, allowing sections to be accurately landed on top of each other. This enables quick and straightforward bolting of connections when working at height, making the system well suited to helicopter installation.

For sites with restricted access that require a helicopter build, this should be identified at the enquiry stage so the appropriate specification can be assigned.


Helicopter install welded flanges

5G Rooftop Stub Towers

RRUs, MHAs and active routers are mounted at the base of the structure on the roof grillage. Access to this equipment can be carried out without climbing the tower or powering down the antennas.

FLI Rooftop stub tower for 5G mobile

Temporary Towers

High-capacity 5G towers are available for temporary site applications.

FLI Structures’ temporary lattice tower and gravity foundation solution is engineered for rapid deployment in restricted-access environments, making it well suited to special projects and temporary events with tight deadlines and minimal ground disturbance.

Kentledge Foundations

Kentledge foundations provide a fast, non-intrusive solution for temporary towers on firm, level ground. They are well suited to short- and medium-term projects, particularly where ground disturbance is not permitted, such as sites with buried utilities, contaminated ground or archaeological sensitivity.

More about Temporary Towers 

FLI Temporary tower kentledge foundation

Heavy Duty 5G Tower : T3a

This new tower has been designed to accommodate larger antennas, increased ancillary equipment and sites exposed to the highest wind speeds. It is ideally suited to site-share applications and is available as an off-the-shelf design up to 40 metres, with the option of rapid-deployment steel foundations.

CAD blocks and AR models are available on request.
T3a Information & Planning Drawings

T3a FLI heavy duty 5G tower
T3b slimline 5G tower from FLI

T3b Slimline Towers

This slim tubular tower has been developed specifically for the Shared Rural Network project. It is designed for installation in remote locations and sensitive environments.

The design allows parallel sections to be inserted between tapered sections to suit loading requirements, maximising structural efficiency and simplifying antenna mounting. The tower is available in heights up to 30 metres, with modules in 2.5 metre increments and a 400 mm face width on the upper sections.

The structure can be hand built without the need for cranes, off-loading equipment, trackway or helicopter access.
T3b Information & Planning Drawings

Low profile & installation without plant: SLP4

The SLP4 is a parallel lattice tower with a low-profile form, well suited to sites with sensitive planning requirements. It is available in heights of up to 40 metres.

The tower can be assembled by hand using a derrick and combined with FLI Structures’ hand-buildable gravity base to deliver a complete installation without the need for plant. This makes the SLP4 particularly suitable for remote locations or sites with difficult access.
SLP3 & SLP4 Information & Planning Drawings

SLP4 low profile parallel tower. Hand install.

AD 1003 F

FLI Structures has refined the industry-standard 1003 design into a low-profile triangular lattice tower. Using welded modules of 3 m or 6 m in height, the tower is well suited to cross-polar antennas and meets deflection criteria required for microwave link applications.

AD 1003F low profile lattice tower from FLI
Guyed mast from FLI

Guyed Masts

FLI Structures has designed, manufactured and installed guyed masts worldwide and offers a wide selection of parallel mast modules with integrated guy attachment points for these applications. Guyed masts provide the most cost-effective method of supporting equipment at height, where sufficient land is available to accommodate the required guy footprint.

AD 1003 lattice tower from FLI