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In 2016, Syntony opened a New York branch with help from a startup accelerator program run by state-owned French investment bank Bpifrance.

Syntony, whose SubWave geolocation system already operates in the subways of Stockholm and Helsinki, is in talks with several other cities including New York, Paris, Toronto, Seattle, Montreal and Los Angeles.

The most effective arrangement is one in which the radiator draws off gradually a large supply of energy from a non-radiating circuit, and so sends out a true train of waves, and not mere impulses, into the ether, and as we shall see later on, it is only when the radiation takes place in the form of true wave trains that anything like syntony can be obtained.

Before concluding these articles we shall return to this subject of electric resonance and syntony, and discuss it with reference to what is called the tuning of Hertzian wave stations.

Since that date much experience has been gained and large power stations erected, and a statement has been frequently made that syntony is no protection against interference when one of the stations is sending out very powerful waves.