The present invention is a fence assembly comprising fence segments and connectors. The external tube has a cross-sectional shape which has a height in the major axis which is greater than its width in the minor axis perpendicular to the major axis, preferably oval, or comprising two semi-circles connected by common straight line tangents parallel to the major axis. Because multiple flare lashes are used an installer can weave an alternating thread on opposing sides of the real lash and the false flair lashes. A difference is computed between the determined magnitudes for a first set of the samples and the determined magnitudes for a second set of the samples, and a local oscillator correction factor is generated based on at least the computed difference. A plurality of the devices on a single substrate may be combined to form an integrated circuit.