An aircraft, comprising: a fuselage; at least one wing extending from the fuselage; at least one horizontal stabilizer extending from the fuselage; and a vertical stabilizer extending from the fuselage and including a composite panel, wherein the composite panel includes a core structure and at least one composite skin extending across an external surface of the core structure, wherein the core structure comprises: a first side; a second side; and a connecting region that interconnects an upper portion of the first side with an upper portion of the second side; wherein: (i) the first side, the second side, and the connecting region at least partially define an antenna housing defining a housing volume configured to contain an aircraft antenna of the aircraft; (ii) the first side, the second side, and the connecting region together define an electromagnetic wave transmission region configured to permit electromagnetic waves to pass therethrough; (iii) the electromagnetic wave transmission region defines a plurality of kite-shaped voids arranged in a repeating pattern; (iv) the plurality of kite-shaped voids is bounded by a corresponding plurality of walls; and (v) at least 10% of the corresponding plurality of walls extends at least substantially perpendicular to a surface (122/124) that bounds the electromagnetic wave transmission region. a fuselage; at least one wing extending from the fuselage; at least one horizontal stabilizer extending from the fuselage; and a vertical stabilizer extending from the fuselage and including a composite panel, wherein the composite panel includes a core structure and at least one composite skin extending across an external surface of the core structure, wherein the core structure comprises: a first side; a second side; and a connecting region that interconnects an upper portion of the first side with an upper portion of the second side; a first side; a second side; and a connecting region that interconnects an upper portion of the first side with an upper portion of the second side; wherein: (i) the first side, the second side, and the connecting region at least partially define an antenna housing defining a housing volume configured to contain an aircraft antenna of the aircraft; (ii) the first side, the second side, and the connecting region together define an electromagnetic wave transmission region configured to permit electromagnetic waves to pass therethrough; (iii) the electromagnetic wave transmission region defines a plurality of kite-shaped voids arranged in a repeating pattern; (iv) the plurality of kite-shaped voids is bounded by a corresponding plurality of walls; and (v) at least 10% of the corresponding plurality of walls extends at least substantially perpendicular to a surface (122/124) that bounds the electromagnetic wave transmission region. (i) the first side, the second side, and the connecting region at least partially define an antenna housing defining a housing volume configured to contain an aircraft antenna of the aircraft; (ii) the first side, the second side, and the connecting region together define an electromagnetic wave transmission region configured to permit electromagnetic waves to pass therethrough; (iii) the electromagnetic wave transmission region defines a plurality of kite-shaped voids arranged in a repeating pattern; (iv) the plurality of kite-shaped voids is bounded by a corresponding plurality of walls; and (v) at least 10% of the corresponding plurality of walls extends at least substantially perpendicular to a surface (122/124) that bounds the electromagnetic wave transmission region.