An antenna installation having an antenna and a wire assembly. The antenna has a first end and a second end, with the antenna having a radiative distribution pattern and RF input characteristics. The wire assembly is positioned in close proximity to the antenna. The wire assembly includes a conductor and an RF insulative wrap. The conductor has a first end and a second end and at least one conductive element extending between the first end and the second end. The RF insulative wrap encircles the conductor between the first end and the second end. The RF insulative wrap includes a magnetic sheet having a magnetic metal powder within a polymer matrix. A method of preparing a wire assembly as well as the wire assembly itself are likewise disclosed.