Use this Non-Penetrating Roof Mount Base to safety and securely install dish antennas on flat roofs where drilling holes isnt an option. The heavy-duty steel base consists of (6) pieces of equal length which can be assembled from 35.5 x 35.5 up to 36 x 36 for a wide-set, sturdy base the perfect size for the concrete blocks needed for ballast (not included). Additionally, the (4) struts of the unit are 22.5 in length. Once placed and weighed down, simply add a mast (sold separately), and attach your antenna/dish of choice. See our selection of compatible masts: SKY32817A, SKY32817B, SKY32817C, and SKY32817D.