Small enough to fit in your glove box or your bug-out bag. The UV resistant ABS plastic housing encloses an efficient matching network allowing the antenna to be fed with common 50 ohm coaxial cable on the SO-239 connection.  The EF 40-6 contains a trifilar wound, 9:1 UNUN (unbalance to unbalance) toroid matching transformer that will match the high input impedance of an end fed antenna into the range where most antenna tuners can produce good performance.  The matchbox handles 100 watts of power.  A 39 foot insulated Poly-Stealth 18 gauge stranded wire antenna and #10 solder lug is included.  Poly-StealthTM high-strength antenna wire is made with high-strength, high-conductivity, bare copper-clad steel (BCCS) wire and insulated with a high-quality, UV-resistant polyethylene jacket to provide you with one of the strongest and longest lasting antenna wires on the market today. Poly-StealthTM wire is perfect for situations that require antennas be hidden from view. The insulation has a low-Gloss finish, and their small size makes wire disappear into the background. That doesn’t mean, however, that the wire isn’t rugged. The insulation has superior abrasion resistance for running through trees and is UV and weather resistant for use on the seacoast or in other harsh environments. Experience has shown that most external tuners and many internal tuners will tune 80-6 meters with an antenna length of 22- 30 feet. If a longer antenna is desired, the provided antenna can be lengthened.  Do not place a balun in the coax line. Doing so will interfere with antenna performance.    The end fed antenna works well in horizontal, sloper, and vertical configurations. Portable operation could not be easier.  Hang it up in a hotel balcony or string it up in the attic. End insulators are supplied making suspension easy. Makes a great SWL antenna also. Completely ready to go, screw in your coax and your on the air. Remember stay away from power lines.