The FBAL 9178 collapsible open conical elements offer the same exceptional performance as the BBAL 9136 biconical elements, featuring circular directional patterns in the H-plane and “8”-shaped patterns in the E-plane, along with a stable phase center and similar gain. Their foldable design enhances portability, reducing space requirements for transport and storage. This makes the FBAL 9178 a versatile choice for high-precision testing across diverse environments, combining efficiency with convenience.