Simple Ham Radio Antennas

  If your antenna space is limited, please consider this small space 40 meter antenna from Callum (M0MCX). This antenna was devised while Callum and Wendy were taking a break in Cornwall (UK).  This improvised idea turned out rather well, considering the restricted space available for a HF antenna. If you can't see the video, please insert this title URL into you browser search box:  https://www.youtube.com/watch?v=6rtw2O0ZBIg. Thanks for joining us today. Aloha es 73 de Russ (KH6JRM), Here are some comments from Callum (M0MCX): Three different antennas could have worked here. My personal challenge was to fit an antenna into a VERY SMALL area at the front of a property. I put up the DX Commander Expedition Antenna and made some fine DX Contacts. Would you have done it differently? Here is the link to our Linear Loaded Dipole:     • Small Cheap Linear Loaded 80m Dipole   73, Callum. 00:00 Intro 00:26 Land Av...

"M0UKD calculator to make a Slim Jim or J Pole Antenna." Views expressed in this antenna project are those of John (M0UKD). Content and Source:   https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/ Please check link or scroll down to read John's article. Thanks for joining us today. Aloha es 73 de Russ (KH6JRM). Slim Jim and J Pole calculator Slim Jim / J Pole antenna calculator. Frequency MHz Velocity Factor (see text*) vf Actual wavelength metres Wavelength considering velocity factor metres A.  Overall length (λ*0.75)*vf (plus gap for Slim Jim) cm (J Pole) cm (Slim Jim) B.  Half wave radiator section (λ/2)*vf cm C.  Quarter wave matching section (λ/4)*vf cm D.  50Ω feed point. Adjust for 1:1 SWR. (λ/40)*vf cm E.  Gap (λ/100) cm F.  Spacing - not critical cm Before we start, be prepared to experiment! The calculator will get you close (or spot on if you're lucky), but there are so many variables. You can use an antenna analyser to easi...