The MFJ-342T is a ⅜ - 24 threaded HF antenna pipe/mirror mount that holds MFJs HFmobile HamTennasTM or any ⅜ style whips steady on your automobiles mirror, luggage rack or other pipe. Hard aluminum clamps can mount to a ¼" or ½ pipe. SO-239 connector w/lock washer feeds coaxial line underneath ⅜" connector. Coax not included with this unit. Also see the MFJ-342S and MFJ-344 for similar mounts.