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What is the advantage of multi-band repeater over a single band repeater?

Carrier aggregation: The more bands you have, the more carrier aggregation (CA) can take place.  CA is when the operator combines 2 or more frequency bands to provide the user will much higher bandwidth and data speed. One of the core technologies of 5G to enable to perform at these super high speeds is CA.

Redundancy: The more bands you have, the more robust your system will be. Even if one band is compromised,(which can happen alot) your phone can still use the other bands.

Future Proofed: The more bands you have, the more likely  your system will  function well in the future. The radio frequency landscape changes all the time. Think of the transitions from 2G to 5G. Limiting yourself to just one frequency means you are less likely to benefit from new improvements the operators make to their networks as time goes by.

Covering Natural Signal: It is very important that the “natural signal” in your building is “covered” by the repeater. Mobile phones always try to connect to the highest mobile signal that is available. Lets take an example of a house that has installed a single band 900MHz repeater. If 1800MHz is available in this house, even it it is very weak, the phone will bypass the repeater completely, and connect over the weak 1800Mhz signal. By installing a multi-band repeater you can reduce the chance of this happening. ideally we would just install a 6 band repeater and not have to think about this. However, the cost is prohibitive for domestic installation, so a dual or tri-band is a good compromise.