MFJ Enterprises Original MFJ-1640T 40 Meter HF Stick Mobile Antenna - 3/8-24 40 Meters Monoband Mobile Antenna Note: We do not recommend using with Magnetic Mounts. A heavy duty 4 foot, 3/8 inch diameter fiberglass rod, a nearly indestructible .125 inch diameter PH-17-7 stainless steel whip and chrome plated brass fittings will give you years of dependable service. Handles 250 Watts PEP. About 7 feet tall fully extended and collapses to 4 feet for easy storage. Simply screws into any 3/8 x 24 female mount