Yes — most intentional radio frequency transmitters imported into the US must hold FCC equipment authorization (certification, Declaration of Conformity, or verification, depending on the device class) before they can be legally marketed or operated. Importers should confirm authorization status prior to shipment to avoid detention or refusal at the port of entry.

A base station with an integrated receiver (transceiver) is classified under the heading for transmission apparatus incorporating reception apparatus (SITC 76432), not here. Only equipment whose sole function is transmission, with no built-in reception capability, falls under 76431. Technical datasheets confirming the absence of a receiver are important supporting documents.