Each lens of a pair of lenses is provided on at least one of its faces with an antireflection coating having a luminous reflection factor Rv that is 2. When a hybrid access terminal is operating under a first air interface protocol, in a mode in which the terminal does not search for the presence of wireless service under a second air interface protocol, the terminal sends a request to a base station seeking to hand off to a wireless coverage area under the protocol. Preferably, the sheet elements are composed of flexible material and are attached to the string in a corrugated shape, wherein the sheet elements are provided with at least one row of apertures for weaving a string through successive apertures of the row. Thus, the metallic boards are firmly held in position by means of tops of hollow holding end portions of those connectable parts that are joined to small through holes thereof.