Siretta alpha adhesive mounting antennae siretta alpha183msmamss26 sirettas alpha 18 is a small low profile adhesive quad band and 3g horn antenna the compact doublet is designed to fix discreetly and securely onto most surfaces so whether the alpha 18 is on top of an energy meter or on the side of telemetry equipment it delivers flawless performance and connectivity in various environments and applicationssupplied with a 3m adhesive base the alpha 18 is perfect for quick and sim