10-160M HF EmComm end fed JPole Sr

$219.00

10-160M & Tuner Free

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Availability: In stock

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RG58u Coax
1 × 50 feet of RG-58/U Coax w/PL-259s
$49.00
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1 × 18 feet of RG-58/U Coax w/PL-259s
$34.00

60-foot HF end fed antenna for 10-160 meters that enables a tuner to achieve a near perfect SWR, with limited efficiency while using a tuner on 160 meters. Rated #1 by eHam users as the best horizontal end-fed antenna for base operations for over 10 years.

Reviews

Here is what everyone is saying about this system: eHam Reviews

HF End Fed Antenna Specifications

  • Frequency Coverage: 1.8-29.7 MHz (160-10 Meters) NOTE – 160M requires an external tuner
  • Peak Power: 250 PEP SSB, 125 CW, or 25 watts for digital modes. NOTE – The MIL-STD-188 M110a digital communications mode is rated at bursts of 100 watts digital for up to 1 minute using the MIL-STD Data Modem Terminal (MS-DMT) and Automated Message Terminal (AMT) software applications.
  • Length: 60 Feet
  • Weight: 1 pound
  • Configuration: End fed antenna configurable as Sloped or Horizontal
  • Connector: UHF type SO-239

Analysis

60 Foot element
10 Meters 1.61
12 Meters 2.43
15 Meters 1.75
17 Meters 1.52
20 Meters 2.20
40 Meters 2.67
80 Meters 2.08
160 Meters Between 5:1 or 6:1 so an external tuner is required.

HF JPole Sr antenna SWR Analysis

Deployment

Please visit us at Alpha Antenna – YouTube for instructional videos.

Click Image for the Configurations Page

end fed antenna deployment examples

Specifications, prices, and descriptions are subject to change without notice.

Reviews

5.0
Based on 73 reviews
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1-5 of 73 reviews
  1. CN

    I really like this antenna. I was able to listen to hamradio crash course josh in California make contact to someone in New Zealand im in Central ohio. My radio is the g90

  2. J

    We bought the Alpha Antenna JPole Snr direct from Alpha probably a month or two ago because the dealers in the uk were all either showing as sold out or discontinued product but hadn’t had a chance to get it up outside till last weekend. We bought the antenna knowing that it was known as a compromise antenna being so short at only 60 feet long. We weren’t expecting miracles from the antenna because of the short length of the radiating element. The Jpole Snr was bought to complement 2 existing end fed antennas 1 of random length and one being an end fed dipole cut for 40 meters and 1 multi band antenna being a multi band vertical covering 80 meters up to 6 meters, another vertical antenna covers 10 an 12 meters as a 5/8th wave vertical dipole. Various dipoles cover the bands from 40 meters to 10 meters. Myself and my wife finally managed to get the antenna up outside at the weekend and it has really been an eye opener for us as its mounted at 6/7 feet at the low end and about 16/17 feet at the high end so again we weren’t expecting miracles from the Jpole Snr. I’m pleased to say that the antenna has beaten all expectations for us so far. I’m not a dxer or contester by any stretch of the imagination but regularly hear Australia, Japan etc regularly on 10/12 meter 5/8th wave vertical dipole but definitely didn’t expect to on the Jpole Snr. Australia etc are mostly only down a few S points using the Jpole Snr. It tunes most bands with the internal tuners on both the ic-7300 and ic-7610 and all bands with the help of an external tuner. I have received solid signals and signal reports on all bands tried so far, it is equal to or better than the 40 meter end fed dipole which is up slightly higher than the Jpole. So far the Jpole is equal to about the same or in a couple of cases better than resonant dipoles for the 40 meters and above bands. I don’t have a full size antenna for 80 meters up yet but the Jpole beats the multi band vertical that i do have on the 80 meter band and also most other bands that it covers. So far the Jpole seems to be a solid performer on incoming and outgoing signals from the contacts made in and around the uk and europe and also into both North and South America. I haven’t had the opportunity yet to try it for a lot of countries but I think it will be ok. The antenna is well built and seems to be made from high quality components with the wire itself being suited for outdoor use as it is a decent quality direct bury type of wire. So far so good for us with the Jpole Snr and I’m glad I made the purchase. Using a rig expert aa-650 zoom analyser the Jpole shows a reasonable swr on all bands covered, most bands are under 3 swr and a few are under 2 and the bands I can’t tune with the internal tuners I can tune with the manual tuner. For what it is and what it can do for me it was a good buy. 73. John. Glasgow, UK.

  3. NN

    The best antenna you can have for a smaller backyards, I have 61 countries 311 QSOs in last month, both on SSB and FT8 at 30W. My LDG tuner can Tune all the bands with ease.

  4. SB
  5. RH

    Unique design with the counterpoise routed along the radiating wire. I rarely use the antenna tuner my yt-991a has, good > 2.0 match almost across the spectrum with some deviation on 40 meters (2.5 SWR)

Weight 5 lbs
Dimensions 12 × 5 × 10 in
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Q & A

Ask a question
Does this antenna need a support rope? Paul R. asked on April 18, 2024

Yes. Please see the manual for rope use here https://www.alphaantenna.com/manuals/JPole_Sr_v2.9_by_Alpha_Antenna.pdf

admin answered on April 24, 2024 store manager
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Should a BalUn or air choke be installed? Q A asked on December 28, 2023

You may need one mainly if you are experiencing common mode current, especially after you have placed ferrite beads on the devices power cord that is experiencing common mode current. Note - Sometimes resolution is made by simply moving the devices power cord to a different circuit. If, for example, you still hear your own transmission coming from a pair of speakers then we recommend reading the following article: "The Need (or not) for Antenna Baluns or Chokes": https://www.alphaantenna.com/community/hints-and-kinks/news/the-need-for-antenna-baluns-ensuring-efficient-signal-transmission/

admin answered on December 28, 2023 store manager
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How high should this antenna be installed? Q A asked on December 28, 2023

To enhance NVIS, mount the element lower than 8 feet in a horizontal configuration. For better DX, mount the element in the clear and sloped into the direction you want to launch your signal. For example, with one end at 6 feet and the other at 30 feet (Note that higher typically results in more DX). Again, the slope helps determine the angle and direction that your signal is launched.

admin answered on December 28, 2023 store manager
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How did you build this antenna to achieve such low SWR’s? Q A asked on December 14, 2023

Previous design: In July 2023 Alpha Antenna changed what was their 5:1 UnUn with a single element as the radiator and one element as the counterpoise.

Current design: The result of this change is an end fed fan dipole arrangement fed to a modified 5 to 1 UnUn.

What changed?: While monitoring with both RigExert and AIM analyzers, physical changes were made in real-time to the inductor with the new configuration of the two wire elements attached. Those analyzers simultaneously monitored all of the bands, while physical changes were made to the inductor. We stopped making changes once the best values were presented. During this process, we found that the shorter leg of the two wire elements also had to be modified to present excellent results. The value of the new UnUn has not been tested, nor do we care to test it, we simply enjoy the results of a finely tuned system.

Comments: To construct the UNUN, specialized tools were built on our 3-D printers. Without these tools, construction of the new UnUn in a production environment was nearly impossible. Fortunately, we use Fusion 360, which made designing the tools possible.

admin answered on December 14, 2023 store manager
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Regarding the 2 parallel elements that for the shape of a ‘J’; Is the 2nd wire a transmitting element like a dipole or is the 2nd element a counterpoise, and are both wires strung along the same axis or is the 2nd one sloped down beneath the 1st one at a steeper angle? Q A asked on December 8, 2023

The JPole (Jr & Sr) are derived from a fan dipole’s design, which simply enables RF to select the element(s) with the path of least resistance for the resonance required to provide acceptable SWRs. The second shorter element is an active element that that is attached to the longer element in a zip cord configuration. This enables the end fed JPole antenna to have access to 3 electrical lengths of wire. These lengths are: 1) The shortest element, 2) the longest element, 3) and an even longer combined length of 1 and 2. Then an inductor matches the impedance at the point where your 50-ohm coax attaches to the match. Operationally, the JPole Sr is designed with the optimum lengths of elements, and the 34-foot JPole Jr was designed for those who do not have the room to deploy a 60-foot JPole Sr antenna.

admin answered on December 8, 2023 store manager
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