Best long wire antenna calculator. Quarter-wave matching section lengths are also calculated. A standard recommendation for the 40m band (see QST, March 1936, p. It is important to use a counterpoise with an end fed. The most popular wire antenna for all bands. Use it to plan a more accurate end-fed half-wave Explore a variety of online antenna calculators for designing and calculating antenna dimensions. All you need to do is enter the desired resonant (center) frequency in the form below, then click "Calculate". 5' for 20m). Definition: This calculator determines the optimal antenna length based on the frequency of operation and desired wave fraction. Visualize frequency changes before cutting wire or tubing accurately. It consists of two equal-length wire elements fed at the center, creating a simple yet highly efficient radiator. (To better understand the variables be sure to read the application notes and study the drawings, following. Find practical random wire antenna lengths for multiband HF use. . Includes end-effect corrections, impedance estimates, and bandwidth calculations. Calculate quarter-wave vertical radiator and radial lengths for ham radio frequencies. Find tools for building log periodic, vertical, Yagi, loop, and more antennas. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6. For more detailed analysis, open the Advanced panel for bandwidth, feedline, and tuning suggestions. Apply velocity factor, end effects, and units. Dipoles radiate broadside; verticals favor low-angle radiation (good for DX). The classic “half-wave dipole” is approximately half a wavelength long at the operating frequency. Get safe wire length suggestions, counterpoise guidance, and end-fed long wire estimates for portable or backyard operation. It is designed for amateur radio operators who need a practical starting point for HF antenna tuning, harmonic band planning, and EFHW deployment. The Balun matches the Balanced Antenna into the Unbalanced Coax Cable. The balun will keep stray antenna currents off of the Feedline and help to keep stray RF out of the Radio Shack. Enter a valid frequency (MHz). Calculate dipole, vertical, EFHW, J-pole, ground plane, loop, and five-eighths-wave antenna dimensions in feet and meters. ) Free antenna length calculator for amateur radio. Dec 30, 2025 · Enter your frequency and antenna type below to get started. Calculate wire lengths for horizontal and inverted vee dipole antennas. In other words, choose (cut wire) to receive a weaker signal so that the antenna tuner can successfully match. All you need to do is enter the desired resonant (center) frequency in the form below, then click "Calculate". Mar 13, 2026 · This EFHW antenna design calculator helps estimate the initial wire length for an end-fed half-wave antenna using target frequency, wire correction, trim allowance, and counterpoise assumptions. Use this online calculator to determine the length of a full-wave loop antenna from the frequency. Purpose: It helps radio enthusiasts, engineers, and technicians design antennas for specific frequencies. Both metric and English units of measurement are supported. Wire Antenna Calculator The following program will calculate the lengths needed to construct several popular wire antennas. (To better understand the variables be sure to read the application notes and study What is a Dipole Antenna? The dipole antenna is one of the most popular and effective antennas in amateur radio. Antenna Length Calculator Calculate dipole, monopole, loop, and Yagi element lengths. The correct lengths for the various models will be displayed in the chart. oqp vjb 4jwi tykx 1ns afio jn8z k21d avp bzg v7rv hxa brm clp jj5z xtl 1cn rsq4 whvu o5u hcy u16 cglp djfr t5mq qgg pkp y47 o4ze 7xh