A portable odorous gas filter may provide for substantially even distribution of byproduct gas throughout a containment vessel by utilizing a diffuser plate having a plurality of holes therein. A linkage arrangement supports the main flap element from the aircraft wing for movement relative to the wing, and includes including a drop hinge link arrangement having a fixed strut secured to the aircraft wing and a drop link secured to the main flap element. Linear detour elements 105a and 105b are connected to the pair of vertices of the rhombic antenna sections arranged at each end.