The traps are parallel-tuned circuits, which provide efficient isolation between the vertical sections, permitting multi-band operation. Broadband operation, with low SWR over the entire ham band, is possible in a proper installation. The antennas are designed to provide for optimum performance from both an electrical and a mechanical standpoint.Mechanically, these antennas boast a heavy duty base and heavy duty aluminum tubing. The mechanical assembly is accomplished with all stainless steel hardware. The performance provided by the Hustler 4BTVs is better than that of any other antenna of this type. The antennas provide a nominal 52 ohm base impedance when installed and tuned. The radiation efficiency is equivalent to, or greater than, other trap verticals. Mounting: - Ground mount with or without radials, roof or tower mount with radials. Vertical support up to 1.75 in. The item "Hustler 4-BTV 4 Band Trap Vertical HF Antenna 10 15 20 40 M for Ham Radio" is in sale since Monday, August 5, 2019. This item is in the category "Consumer Electronics\Radio Communication\Antennas\Ham, Amateur Radio Antennas".antennastore" and is located in Lockport, New York. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Aruba, Dominica, Grenada, Saint kitts and nevis, Montserrat, Barbados, Bolivia, Ecuador, Guadeloupe, Iceland, Jordan, Luxembourg, Martinique, Nicaragua, Oman, Peru, Paraguay, Viet nam, Uruguay.