A) Why do you have to oil it? B) If you are going to lubrcate it in any way, get on top of your unit with a spray can of silicone from your local auto store. C) Silicone doesn't gather dirt like oil/WD40 ect. D) Spray the joints and wipe up all excess with a rag ? or best T shirt you have on. :B
Also please wear gloves and safety glasses,And have some one inside atempting to slowley raise and lower the antenna while you are doing the spraying a little at a time. AND BE CAREFUL up there.:E Chuck