Choose an antenna that matches the radio and the installation. Check its gain across the required bands, the MIMO connections and the loss through the complete cable run.
Check the router before choosing the antenna
Find the antenna connection instructions for the exact hardware version. Confirm which ports are cellular, whether an external-antenna setting is required and which bands those ports serve. Some products have no user-accessible cellular antenna connectors.
Match the connector type and contact arrangement, not just the thread. SMA and RP-SMA are not interchangeable connections. Never force a connector or assume that a port marked Wi-Fi can be used for cellular service.
Check the frequency range against the operator bands you need. A product described as a 5G antenna may not cover every band used in your country. Read the frequency and gain tables, not only the product name.
Count the cellular connections, not all the cables
One antenna enclosure can contain cellular, Wi-Fi and GNSS elements. Four cables coming out of it do not necessarily mean four cellular connections. Follow the labels and the router port map.
A MIMO installation uses separate radio paths. Follow the approved antenna arrangement for the router; do not split one antenna lead across several ports. A four-element antenna does not turn a two-path radio into a four-path radio. If you are mixing a four-element antenna with a two-port router, obtain the correct element-pair instructions from the antenna supplier.
Directional or omnidirectional?
For a fixed site, a directional antenna is worth evaluating when you can aim and secure it toward a useful network signal. An omnidirectional design is often more practical when a vehicle changes direction or the useful network direction is not fixed.
Neither choice guarantees a better connection. Compare actual readings and wired performance at the intended mounting point. Follow the antenna instructions for orientation, spacing and any ground-plane requirement.
Why more gain is not always better
A passive antenna does not create transmitter power. Gain describes how effectively it concentrates reception or radiation in a particular direction, relative to a reference. Check the radiation pattern as well as the peak dBi figure. A narrower useful pattern can make alignment or vehicle movement more important.
Gain varies with frequency. An attractive peak figure at one band says little about performance on another. Compare the published values at the bands used by your operator, then account for the cable and connector losses.
Include the whole cable run
Use the cable supplier's loss figure at the operating frequency. Multiply loss per metre by the installed length, then include connectors and adapters. Keep the coaxial run as short as the installation reasonably allows.
For illustration only: an antenna with 8 dBi gain and 4 dB of cable and connector loss has a net gain of 4 dBi in that direction, at the frequency being evaluated. This excludes other installation effects and does not predict a speed increase or describe a QILTON product.
If the planned coaxial route is long, compare it with a suitable outdoor CPE connected by Ethernet. Check power compatibility and environmental ratings before changing the design.
Test before the permanent installation
Test from a safe, accessible position first. Compare against the original antenna using the same SIM, wired client and test method. Keep the position that improves the connection consistently, not the one that produces a single peak result.
Follow the equipment instructions when connecting antennas. Outdoor connectors need the specified weather sealing and strain relief. Roof work, mast installation, bonding and lightning protection should be handled by a qualified installer under local requirements. Do not work near power lines.
Before ordering, send the supplier the router model and hardware version, operator bands, connector details, required cable length and a description of the mounting point. Ask them to confirm compatibility in writing.