Vertical collinear antenna calculator. Calculate the required dimensions for a coaxial collinear antenna construction for any given frequency. It has been known for a long time and is often called the Marconi-Franklin antenna. Design, calculationThe vertical collinear antenna is an omnidirectional high gain antenna. It's a good choice for repeater installations and can be top, or side mounted to the tower. Bandwidth is normally 10 MHz on . Sep 24, 2022 · Coaxial collinear Wi-Fi antenna. This is an introduction to a high gain VHF/UHF vertical collinear antenna program and project that can be an asset to many of you that are looking for more gain in a vertical antenna for base or repeater use. The higher the gain the narrower the elevation pattern. FYI -- This was (many years ago) for a science fair I entered. Didn’t win but had a great antenna when I was finished Introduction This rugged antenna, an omnidirectional collinear, is capable of surviving harsh environments. You can obtain approximately 3 to 10 dB of gain over a dipole, depending on the number of elements you use. CO LINEAR ANTENNA DESIGN While it is not possible to home-brew a commercial quality antenna, it is very feasible to build a collinear antenna for average use. Sep 9, 2025 · Explore a variety of online antenna calculators for designing and calculating antenna dimensions. Free Online Engineering Calculator to find the Dimensions for a Collinear Antenna Array. There are several ways to form such Coax Collinear Antenna Calculator The coaxial collinear antenna is made from two or more sections of coax cut to length for a specific frequency and connected to each outer in an 'out of phase' manner ending with a quarter-wave matching stub. The collinear antenna calculator serves as an indispensable tool for engineers and professionals in designing these antennas accurately and efficiently. The calculator provides an estimate of the isolation provided by two vertically separated antennas The collinear antenna, or Marconi-Franklin antenna, is an omnidirectional, high-gain antenna composed of in-phase half-wave dipoles aligned vertically. A collinear antenna is an antenna array of in-phase half-wave dipoles with serial excitation, elongated in a single line, hence the name — collinear. Find tools for building log periodic, vertical, Yagi, loop, and more antennas. It provides guidance on the required frequency input, coax velocity factor, and element measurements for optimal performance. Use our simple calculator to determine approximate dimensions of materials needed to build a vertical antenna. Adding segments increases gain but narrows bandwidth. Sep 24, 2023 · One particular antenna type, known as the collinear antenna, has gained prominence for its ability to maximize range and signal quality. NOTE: This is not an antenna for the beginner antenna builder! Jul 24, 2025 · This page offers an online antenna designer tool for Hams to calculate the dimensions needed to construct a coaxial collinear antenna for a specific frequency. This article describes a collinear antenna made from very inexpensive RG58/U coaxial cable and encased in PVC pipe. By using quarter-wave transmission line segments, it maximizes gain at a low horizon angle, outperforming a half-wave dipole. This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen. gh yvjy51 dfg imagl p2apby z12zen a9z7 pxx ommqg haf