An antenna system for a radio frequency electronic device includes a printed circuit board, a ground plane, and an active element. The engagements between the first and the second retained members, and the pillar can be released by deforming the pillar trim to separate the other end of the first retained member and the other end of the second retained member. Two or more layers of woven fabric are loosely stacked together so as to permit relative slippage therebetween and are rotationally offset by an offset angle selected so as to inhibit mechanical interference between opposing adjacent surfaces of the woven fabric layers during slippage therebetween. And, a flow switch for each of the two or more air sampling devices is provided at a location between a corresponding air sampling device and the vacuum source, each of the flow switches being configured to separately measure and control the rate of air flow through a corresponding first vacuum tube. By not fully extracting the retention pin 115, alignment is maintained, simplifying the reinsertion step.