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How to extend Sonoff RF Bridge 433 MHz signal

I own a Sonoff RF Bridge and I am using it for the construction of a home automation system.

Unfortunately, the house where I live has very thick walls, some 433 MHz sensors cannot communicate with the sonoff RF.

Before evaluating a hardware change, I wondered if it was possible to replace the base antenna, with an external one (see the pic)

Could this idea make sense? More suggestions?

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