Abstract: The present invention, in some embodiments thereof, relates to a spreader for spreading paste (for example a tile adhesive) over a surface and more particularly, but not exclusively, to a system for pumping and uneven spreading of adhesive along a surface of a building. For example, the system may include a source of the paste optionally including a mixer, driver and/or conveyer. The paste may be driven to a spreader. For example, the spreader may deposit the paste unevenly over a surface. For example, the spreader may include multiple outlets and/or an uneven spreading blade (for example in the form of a comb). For example, the paste may be spread as lines across the surface.

Abstract: A vertically stacked array antenna structure is described. The structure comprises a radiating layer, a passive layer disposed under said radiating layer, an active layer disposed under said passive layer, and an interface assembly. The radiating layer comprises an array of radiating elements. The passive layer has only passive components. At least a part of the passive components includes an array of RF duplexers corresponding to the array of radiating elements. The active layer comprises RF amplifiers. The interface assembly comprises at least one metallic frame which is in direct thermal coupling with the RF amplifiers. The interface assembly is configured for providing thermal communication of the active layer with a heat exchanger.