feed point

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160 Meter Dipole - The 160 meter dipole is constructed from #12 stranded insulated wire available in most hardware stores. The feedpoint uses a section of PVC pipe Article by W1TR
[ Hits: 1115 | Votes: 2 | Rating: 6 ]
160m Band Loaded Inverted L Antenna - This is a simple 160 meters antenna, a short loaded inverted L. The linear lenght is 20 meters, with the loading coil at 5 meters from the feedpoint.
[ Hits: 320 | Votes: 1 | Rating: 7 ]

Rectangular Loop antenna for 2 meter band - An interesting and easy to build loop antenna for VHF bands, that present a feedpoint impedance of 50 ohms thus avoiding the need for a 1/4 wave impedance transformer. This antenna is ideal for sota and other portable operations
[ Hits: 279 | Votes: 1 | Rating: 1 ]

30m vertical dipole - The 30 Meter Vertical Dipole is constructed from #10 stranded insulated wire available in most hardware stores. The feedpoint uses a T-section of PVC pipe. The coax loops through the PVC pipe to provide strain relief. by W1TR
[ Hits: 2050 | Votes: 2 | Rating: 4.5 ]

The Ugly MacGyver 6 meter J-pole Antenna - Essentially, a J-pole is a 1/2 wave resonant antenna connected to a quarter wave matching stub. The feedline is connected at a point on the matching stub that is at the feedline's characteristic impedance. The result is 3/4 of a wavelength on one side and 1/4 wavelength on the other side.
[ Hits: 202 | Votes: 0 | Rating: 0 ]

80 Meter Vertical Loop - The 80 meter vertical loop is constructed from #10 stranded insulated wire available in most hardware stores. The feedpoint uses a 6 inch section of half inch diameter PVC pipe Article by W1TR
[ Hits: 980 | Votes: 4 | Rating: 7.75 ]

Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
[ Hits: 248 | Votes: 1 | Rating: 10 ]

Speaker Wire Doublet Antenna - A portable wire antenna for the HF bands, made with a common speaker wire. In its natural form, the speaker wire acts as parallel feed line coming up to the bottom of the PVC feed point. From there, it's split into two wires, one heading out each side of the PVC tee.
[ Hits: 395 | Votes: 4 | Rating: 9 ]

20m Half-Wave End Fed - A Half wave antenna has a high impedance feed point. This can be matched using a 1/4 wave stub matching section and converts the 40m vertical into an L-shaped 20m J-Pole antenna. The 300 ohm feeder used for this purpose must be kept away from the ground.
[ Hits: 1845 | Votes: 7 | Rating: 8 ]

20 thru 10 Meter Fan Dipole - The 20 thru 10 meter dipole is constructed from stranded insulated wire available in most hardware stores. The feedpoint uses an 8 inch long section of 2 inch diameter PVC pipe. A section of wire joins the elements at either side of the feedpoint to avoid the inductance of square knots used on lower frequencies.
[ Hits: 3181 | Votes: 14 | Rating: 5.96 ]

To transform ot not to transform - Feed Lines - Transmission lines have many uses other than simply transferring RF power from one point to another. Impedance matching, baluns and filters are probable the most common of these.
[ Hits: 137 | Votes: 0 | Rating: 0 ]

Halo Antenna for 50 MHz - The antenna described in this article is for 50 MHz, but the design can be scaled for any band, including VHF, UHF, or even the higher HF bands. The antenna is nothing more than a square loop of wire, approximately 30" (or ~76cm) per side. The loop is fed in the middle of one side, and the opposite side to the feed point has a gap in it.
[ Hits: 300 | Votes: 0 | Rating: 0 ]

Helical Antennas -Theory - Helical antenna or helix antenna is the antenna in which the conducting wire is wound in helical shape and connected to the ground plate with a feeder line. It is the simplest antenna, which provides circularly polarized waves.
[ Hits: 137 | Votes: 0 | Rating: 0 ]

The Copper J pole Antenna - The copper J-Pole antenna soldered in a couple of hours with an interesting method to setup the feeding point
[ Hits: 677 | Votes: 2 | Rating: 5 ]
J-pole antenna Calculator - Online calculator for J-Pole antennas. The J-pole antenna consists of a short and a long vertical pole with a feed point near the bottom. The antenna looks like the letter J, hence the name J-pole antenna.
[ Hits: 417 | Votes: 0 | Rating: 0 ]

OCF Dipole - This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. It is a dipole fed off center with a 4:1 current balun at the offset feedpoint. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands
[ Hits: 2559 | Votes: 7 | Rating: 9.43 ]

2.6 MHz Halfwave Sloper - The 2.6 Mhz M Dipole is constructed from #10 stranded insulated wire available in most hardware stores. The feedpoint uses a T-section of PVC pipe
[ Hits: 386 | Votes: 0 | Rating: 0 ]

13 elements VHF UHF Yagi - Yagi with 5 Elements on 2 m, 8 Elements on 70cm and one Feedpoint by DK7ZB
[ Hits: 877 | Votes: 3 | Rating: 10 ]
VHF Yagi from Old TV Antenna - 6m/2m/70cm Yagi Antenna Built from Old TV Antenna This turned out to be a great little antenna. It works the 6 meter, 2 meter and 70 centimeter bands. You can use one common feedpoint or two seperate feedpoints depending on how you would like to connect this antenna to your transceiver.
[ Hits: 731 | Votes: 2 | Rating: 10 ]

Balun_cmr Calculate common-mode impedance - This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.
[ Hits: 404 | Votes: 1 | Rating: 10 ]