2 Meter ladder line calculator
End Fed Half Wave Antennas (EFHW)
Interest in the EFHW antenna has sky-rocketed over the last few years, and like many topics under the heading of antennas, accuracy of information can vary.
The following website(s) may help to clear up any questions or confusion about cores and winding ratios.
- From MM0OPX – Colin has a number of useful videos on the EFHW and how to test them: https://www.youtube.com/watch?v=Xe0wvbOQeok&t=5s
End Fed Half Wave Antenna presentation by Todd Longfellow, N7TWL
This presentation was on 10 June 2023 at the TARA General Meeting: The End Fed Half Wave Antenna – pdf. Click here to get PP End Fed Half Wave – PowerPoint
This is a video of an updated presentation on 8 March, 2025.
Notes for SWR Presentation 9 Aug 25 in MS Word
https://n7tar.org/wp-content/uploads/2025/08/SWR.docx
This is the accompanying Video of the presentation. https://youtu.be/E-yf5OMvTak?si=XjcfdZzQNXudLY99
Bob’s (KJ7ZTF) Inverted V Fan Dipole Wire Length Chart.
Cool Antenna Projects (submitted by KJ7ROX)
2 Meter Slot Antenna using a Satellite TV Dish
Useful Links for J-Pole Antennas (please report broken links)
- J-Pole Antenna
- How does it work? https://www.youtube.com/watch?v=GRJw3SCBGfA
- How to build/tune https://www.youtube.com/watch?v=IdbFqVwoV8s&t=536s
- Installing https://www.youtube.com/watch?v=iwyxwXgLQv0&t=59s
- How to feed https://www.youtube.com/watch?v=iVigUBSP9DE
- Unusual J-Pole https://www.youtube.com/watch?v=Pp3PsWz_vII
- Drawing https://www.513repeater.org/elmering/build-a-jpole-antenna/
Antenna Installation Tips
Lightning, Grounding & Bonding for Hams
Tape Measure Beam Optimized for Radio Direction Finding
All the information can be found here: https://n7tar.org/2022/06/12/tape-measure-beam-optimized-for-radio-direction-finding/ Submitted by Hal (KG5LVG)