The present invention relates to an access gate or gantry - antennas assembly for a therapeutical equipment or for an imaging equipment, particularly for an oncological hyperthermia system. In particular, said assembly comprises an access gate or gantry (2), an array of first antennas (3) coupled with said gantry (2), a bed (4), said bed being at least longitudinally movable with respect to said gantry (2), and at least one second antenna (4A), provided in said bed, where said assembly comprises lifting and lowering means (2A) for lifting and lowering said access gate or gantry.