Sole (10), configured to form part of an upper (2) of a shoe (1), or to be placed in contact with the upper (2) of the shoe, the sole comprising a base (15), extending between an upper face (15s), against which a foot, introduced into the shoe, can rest, and a lower face (15i), opposite the lower face, the sole comprising: an alert module ( 30), connected to a transmitting antenna (40), the alert module (30) being configured to generate a transmission signal (S) when a user of the shoe is in a critical situation, the transmit antenna configured to radiate the transmit signal, the alert module extending along the base (15); the sole being characterized in that it also comprises: a first antenna support (41), extending, from the base, to a first end (41 '), in a first direction of extension (? 1), the first end extending a first extension distance (di) from the base (15); all or part of the transmitting antenna (40) extending along the first antenna support (41), between the base (15) and the first end.
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