The antennas included with the device are indeed low-gain SMA antennas, and a gain of approximately 2.8 dBi is consistent with the type typically supplied for compact 4G/5G routers. These antennas are suitable for general use, but keep in mind that 5G performance is influenced by several external factors, including:
Network coverage and signal quality from your mobile operator
Physical environment, such as building materials and nearby obstructions
Router placement, which can significantly affect both signal strength and stability
For best results, try placing the router in an open, elevated position - ideally near a window - and avoid positioning it inside metal enclosures or areas with heavy shielding, as these can noticeably reduce signal levels.
You may also benefit from locking it to the band where you receive the strongest and most stable performance. This can help reduce fluctuations caused by automatic band switching.
You can find a detailed guide on band-locking here:
Feel free to update me on your results or let me know if you have any additional questions.
I already positioned the router at the upper level of my house and near the window which has the best sight to the 5G “sender”; I also played with band locking already.
Both does not help.
Any recommendations for better (indoor) antennas as this was my main question?
For indoor use, there is an alternative antenna option available from Teltonika:
This model offers a higher gain of 3.6 dBi. You can also use third-party indoor SMA antennas, as long as their supported frequency bands match those used in your region.
If improving signal quality is a priority, you may also want to consider outdoor antennas. Depending on your environment, a directional or omnidirectional antenna can significantly boost performance. We offer a suitable outdoor option:
