Air band j pole antenna A simple, cheap twinlead J-pole antenna beats both the stock rubber duck antenna and also the RadioShack 20-176 wideband scanner antenna. This antenna covers the lower end of the 150-160 MHz band, perfect for the Multi-Use Radio Service (MURS), public safety, and business band communications. . Superyagi designed Jpole antenna for the VHF bands Covering from 125 127 mhz airband comercial with secondary millatary 300mhz band Mar 17, 2025 · This is a J Pole antenna cut for the Air band (118 to 136 Mhz). Ideal long range air band reception antenna. The Slim Jim is an end fed folded dipole antenna that gives you approximately 6dbi of gain. Kevin has now started production of this J-Pole model for civil airband and a Slim-Jim design for UHF military airband, and a dual band 126/300mhz J-Pole and to meet the requirements of aviation enthusiasts like me. 5 db of […]. When cutting the 1/2" copper tubing, cut the 57-1/2" piece A great 222Mhz antenna can be hard to find. If you need a "super" j, use a piece of 3/4" pvc as the insulator and add the stub and another 38 or so inches of conduit. Jul 9, 2020 · Buy KM4HLF J-Pole Antenna for Receiving The AIR Band(118 to 136 Mhz): Radio Antennas - Amazon. This antenna will give you about 2. The choice of construction materials can greatly affect the performance and power handling of the antenna. You may use a Fiberglas rod (arrow shaft) as an insulator, but you will have to be very careful with the torch or you may weaken or burn the rod, or make it brittle. The J Pole antenna is a simple antenna to build for most builders and requires little skill or tools to make it work properly. SWR is 1. That antenna will only pick up signals in the direction that it is pointing. The airband J-Pole antenna is tuned for the 118 – 128 MHz aircraft aviation band. In this article you will find a basic drawing of a J Pole antenna and the lengths, spacings, and other details to build one for the 17, 15, 12, or 10 meter bands. They are usually set to Unicom, but can be tuned to any frequency of your choice at time of order. 650 MHz input frequency. I was so pleased with my results that I purchased enough materials to construct another J-Pole for portable use. Plus the antenna also has the great low noise floor and wide bandwidth typical of our other antennas. From there consider an antenna that is sized to be 1/4 or 1/2 wavelength at airband, like some of the DPD antennas referenced above. This antenna is suitable ONLY TO RECEIVE the Aircraft VHF band (due to the 18 Mhz bandwidth of the air band). While it will degrade outside the band specified it may be a dB or so loss vs the 10 dB for the stock antenna. Convert a J Pole to a Slim Jim More Antenna Projects! Though having a narrower bandwidth than log periodic air band antennas, yagis are easier to construct and provide high gain near the design frequency. If you are on a search and rescue team, volunteer firefighter, or monitor public safety bands, this antenna would be a great complement to your base radio system. A 10 element air band yagi antenna designed for 128 MHz is shown here, and it performs well for reception even at 118 MHz and 137 MHz. What you want is a fairly omnidirectional antenna like a Discone, 1/4 wave Groundplane or J-Pole for example. So unless it's pointing directly at a plane, or the airport it will be difficult to pick up their signals unless they are very strong. The airband J-Pole antenna is tuned for the 118 – 128 MHz aircraft aviation band. Apr 29, 2020 · A store bought VHF air specific J-pole would probably be tuned ok in the center of the band but if your going to make one from scratch and without test equipment its a crap shoot and a simple ground plane would be easier to build and more repeatable. 780 MHz input frequency, and 1. Sep 21, 2020 · Perhaps get a smiley antenna tuned the portion of the band you care most about. 2. Designed and tuned for the civilian aviation band, the Airband J-Pole Antenna serves this purpose quite well. J-pole antenna (also known as J antenna) owes its name to its shape resembling the letter J. Aviation fans prefer this antenna as it works well picking up both land based and airborne transmitters. The slim jim for military airband has a centre frequency of around 300 mhz which would make the longest dimension around 72cm I think. Typically, the 2 meter all copper J-Pole antenna will handle 250 watts or more of power. 01:1 for the 449. Copper Cactus Dual-Band Super J-Pole Antenna Project Building Suggestions 1. Many Live-ATC sites are using this antenna to stream aviation transmissions to the Internet. Dec 28, 2010 · I've experimented with several antennas for the 118-137 airband. Dave, WB5HDS. But even with a good antenna, [pq] unless you live within 15-20 of the airport, the best antennas in the world won’t How much power will a J-Pole antenna handle. This antenna is now delivered as a two piece breakaway model for easy storage Make the "j"out of 1/4" soft copper, Solder it in place thru the hole and add the cable. 2 @ 127 Mhz, this is the mid frequency on the air band. com FREE DELIVERY possible on eligible purchases Sep 9, 2011 · The airband J-Pole antennas are custom tuned for the aviation band, so they work equally well for receiving and transmitting a signal. It was invented in 1909 by Hans Beggerow for use in Zeppelin airships. It is a stunning performer at its design frequency! Mar 17, 2013 · A good quality external antenna, mounted outside will greatly improve your reception of ground to air communications. still really cheap". Fortunately our Slim Jm is now optimized for the 222MHz VHF amateur radio band. J-Pole antennas have been designed and constructed out of a wide variety of materials. Cost about $6 using new parts. 13:1 for the 147. Typically, J antennas are used in shortwave frequency bands (up to 30 MHz), while radio waves can be used for very long-distance (transcontinental) commu Mar 28, 2018 · With a 50 foot length of RG8, and the antenna 20 feet in the air, SWR was a respectable 1. dunr htkcid exzenky agojnd csug brcp busqnoa dmist dcfamtot wiwo scgfm mwsjl ipkwfcu vaio ufhdhsk