i had a piece of hl i ran from barn to house so its inside. i coupled the center to an so239 with a piece of brass hobby tubing, then bolted a strip of perf metal to the 239 and hose clamped it to the hl shield. could seal it with silicone i guess. good for hf and cheep...i said cheap...like me... i save money so i can waste it on other toys...