Siretta mike series magnetic antennas siretta mike3a5msmamss17 the siretta mike 3a is a compact dual mount gps antenna tuned to 157542mhz its small footprint of only 47 x 35mm allows it to fit onto most surfaces comfortably and with a modest height of only 17mm it provides an unobtrusive profile with its magnetic base and separate adhesive pad the mike 3a can be mounted onto a diverse range of surfacesthe mike 3as ip67 rating makes it a well suited outdoor gps antenna that can b