Method for tracking sanitary materials and goods with RFId identification system, said sanitary materials and goods provided with at least one tag containing a microchip containing the data of the material or good and an antenna; said sanitary materials and goods randomly placeable in an area arranged for storage and defining a storage volume; said area being provided with a plurality of transceiving radio frequency identification antennae and associated connectivity devices; said plurality of antennae and connectivity devices placed in a manner so as to receive and exchange information by means of RFId technology inside the set area, so as to automatically record and detect the loading and/or collecting of the labeled materials and goods and exchange information relative to the identified objects; wherein the method provides for: a. carrying out the exchange of tag-antenna information in a range of radiofrequencies comprised between 850 and 960 MHz; said exchange of tag-antenna information occurs by not turning on, at the same time, the plurality of antennae; said antennae being arranged in a number and position in the area set for the storage of the materials and goods in a manner so as to ensure the coverage of the entire storage volume, b. restricting the range of radiofrequencies through the shielding of the area arranged for storage of the materials and goods, and wherein the radiofrequency field varies inside said shielded storage area and the exchange of information in the radiofrequency field occurs: a. creating, for each antenna arranged in the area, a series of geometric configurations of the field by means of a series of pointing directions that are different from each other, b. creating, for each of the aforesaid configurations or pointing directions, a series of different polarizations of the electric field, the set of the combinations (MxN), after the variation of the direction of the field and the polarity, are cyclically repeated over a period of time; during this time interval, not all of the plurality of antennae are simultaneously turned on, wherein the antennae comprises dynamic transceiving antennae, fixed in points arranged inside the storage area, the radiation diagram of said antennae showing a variety of pointing directions that are different from each other, each pointing direction being also enriched by different polarizations of the electric field and wherein the storage area is a cabinet consisting of a closed structure that can be openend and comprising shelves where sanitary materials and goods can be placed, characterized in that the field is varied by arranging antennae on the last shelf on the bottom of the cabinet, the antennae being moved along slide guides along the shelf by means of automatic actuation means, the method providing for varying the radio frequency field by means of the combination of fixed and movable antennae. a. carrying out the exchange of tag-antenna information in a range of radiofrequencies comprised between 850 and 960 MHz; said exchange of tag-antenna information occurs by not turning on, at the same time, the plurality of antennae; said antennae being arranged in a number and position in the area set for the storage of the materials and goods in a manner so as to ensure the coverage of the entire storage volume, b. restricting the range of radiofrequencies through the shielding of the area arranged for storage of the materials and goods, a. creating, for each antenna arranged in the area, a series of geometric configurations of the field by means of a series of pointing directions that are different from each other, b. creating, for each of the aforesaid configurations or pointing directions, a series of different polarizations of the electric field,