Apparatus for performing tomographies by means of microwaves having a main body (12, 21, 31) which develops around an X axis comprising: - a plurality of radio transmitting and radio receiving elements; - at least one support configured to house said plurality of radio transmitting and radio receiving elements such as to allow a first positioning at a distance R from a given point of the X axis and a second positioning wherein at least one of the elements is at a distance R' from said point, with R' different from R; said support being a circular structure whose central point lies on the X axis; - whereby the plurality of radio transmitting and radio receiving elements are a plurality of antennas transmitting and detecting data relating to reflection and absorption of electromagnetic radiation, at least one of said antennas being associated to an R value between 5 and 50 centimeters, - a mechanism configured to move said antennas to the first and to the second positioning by means of the support installed inside or outside said main body, and a calculation unit for controlling said movement; - a signal processing unit configured to perform the task of analysing the signals received by said plurality of antennas and generating signals towards said antennas; - a computing unit configured to perform the task of applying an image reconstruction algorithm, controlling the position of said antennas through said mechanism for moving said antennas; - said one support further comprising two blades extending from the circular structure towards the X axis, each blade being formed as an elongated element having two main ends and each main end being equipped with a fixing means (43, 44) allowing rotational movement of the blade on the YZ plane, the blades being jointed at one of their ends by the fixing means on which one or more of said plurality of antennas are housed, the fixing means of the other one of the two ends of each blade attaching the corresponding blade to said support. - a plurality of radio transmitting and radio receiving elements; - at least one support configured to house said plurality of radio transmitting and radio receiving elements such as to allow a first positioning at a distance R from a given point of the X axis and a second positioning wherein at least one of the elements is at a distance R' from said point, with R' different from R; said support being a circular structure whose central point lies on the X axis; - whereby the plurality of radio transmitting and radio receiving elements are a plurality of antennas transmitting and detecting data relating to reflection and absorption of electromagnetic radiation, at least one of said antennas being associated to an R value between 5 and 50 centimeters, - a mechanism configured to move said antennas to the first and to the second positioning by means of the support installed inside or outside said main body, and a calculation unit for controlling said movement; - a signal processing unit configured to perform the task of analysing the signals received by said plurality of antennas and generating signals towards said antennas; - a computing unit configured to perform the task of applying an image reconstruction algorithm, controlling the position of said antennas through said mechanism for moving said antennas; - said one support further comprising two blades extending from the circular structure towards the X axis, each blade being formed as an elongated element having two main ends and each main end being equipped with a fixing means (43, 44) allowing rotational movement of the blade on the YZ plane, the blades being jointed at one of their ends by the fixing means on which one or more of said plurality of antennas are housed, the fixing means of the other one of the two ends of each blade attaching the corresponding blade to said support.