Siretta alpha adhesive mounting antennae siretta alpha4a1msmamss26 the siretta alpha 4a is an extremely compact self adhesive mounting ip67 rated gps antenna its 37 x 33mm footprint makes it able to be fitted into a wide range of locations and with a height of only 13mm it provides an unobtrusive profilethe alpha 4a is fitted with a strong self adhesive base that provides a firm fixing on most flat surfaces including metal glass wood and plastic it can be used indoors or outdo