The use of a multi-shelved product transporter for transporting products, diverted from manufacturing lines, to a downstream packaging area is a cost effective way of assembling a packaged bundle of products. The flap antenna may also include a flap reflector to reflect the electromagnetic radiation to or from the shaped reflector. The clamping elements each including camming surfaces and braking surfaces such that as a window to which the shoe is attached pivots, the camming surfaces and the camming elements interact to urge the clamping elements together to clamp the portion of the track therebetween.