A tent including a fabric enclosure forming a plurality of walls and defining an interior of the tent. A multi-layer-coupled surface plasmon notch filter is provided to have more than two symmetric metal-dielectric interfaces coupled with one another to produce a transmission spectral window with desired spectral profile and bandwidth. The radio receiver 10 includes a front-end unit converting to an intermediate frequency signal an FM broadcast signal received via a vehicle-mounted antenna 110, a signal line inserted between the vehicle-mounted antenna connection terminal 12 and the front-end unit, and an in-vehicle antenna 14 branching out from the signal line. The network further includes a counting function, which is selected and updated based on the message description.