The EASIEST Antenna to build for Six Meters using one piece of RG-58 coax!

Discussion in 'Amateur Radio News' started by VK7HH, Dec 8, 2020.

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  1. VK7HH

    VK7HH Ham Member QRZ Page

    This is a really simple and easy to construct antenna that will get you on the air on the six meter band using only RG-58 coax!

    I needed a quick and simple antenna for my WSPR beacon over the summer season. Enter the coaxial dipole or aka flowerpot antenna!

    N2ZDH, PU2OLT, KK4ZDS and 15 others like this.
  2. N1IPU

    N1IPU Ham Member QRZ Page

    Would make a decent portable antenna for 6m. Most likely will give it a go.
    KC5HWB and VK7HH like this.
  3. W1YW

    W1YW Ham Member QRZ Page

    I strongly suggest CPVC if available: PVC is lossy at this frequency.

    Here's how the antenna works---

    COAX is a transmission line system where RF current flows in the center conductor. This produces a counter current in the shield which is out of phase. The two cancel in the far field.

    When you expose an electrical quarter wave of the center conductor-the currents become unbalanced and the coax radiates. The short length below the unshielded center section is essential the 'ground' part of a vertical dipole. The multi turns are an RF choke, stopping the coax from radiating below that point. You can use ferrite instead of the coil-choke.

    The fishing line is purely a mechanical strain relief and keeps the coax straight in the tube.

    Build and learn:)
    Last edited: Dec 10, 2020
    VK6APZ, NU4R, KA0USE and 5 others like this.
  4. VK7HH

    VK7HH Ham Member QRZ Page

    Good and lightweight for SOTA!
  5. VE3VXO

    VE3VXO Guest

    How is that simpler than an inverted-vee? Unless you are only planning on using it for repeaters or maybe local simplex what good is it? You would want a horizontaly polarized antenna for Es propagation. An inverted-vee will give you access to both.
    VK6APZ, HB9EPC, VE3CGA and 1 other person like this.
  6. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    A simpler way would be/ just Hook the to coax up to two pieces of wire that is cut 54-in on either side of Center and you have a dipole.
    I have even striped the braids back 54-in. Then use a center for one side and the braid for the other, then add some kind of insulator (I have just use paracord in the past) now that's easy.
    WA4TFJ and AA5LS like this.
  7. VK7HH

    VK7HH Ham Member QRZ Page

    It's simpler as it uses less parts. You don't need a centre insulator, or extra wire. You do not need a horizontally polarized antenna for Es. Es work just as well on a vertical, there is very little polarization mismatch on Es.
    You can also string this us as a horizontal antenna easily
    KC5HWB and KF4ZKU like this.
  8. VE3VXO

    VE3VXO Guest

    "Although polarisation shift can occur, single-hop Sporadic E signals tend to remain in the original transmitted polarisation." Wikipedia link to Es propagation

    So sure you don't need horizontal polarization that's true, but since Es tends to preserve polarization and since most people calling will be using a Yagi array, you might want to have some horizontal polarization if you would like to talk to them. Of course if you really want a challenge, (because 6m Es isn't challenging enough) you could always try to hook up with those other 1% who are using a vertical whip. In that case it will work very well, just as you said.
    HB9EPC likes this.
  9. K3FHP

    K3FHP XML Subscriber QRZ Page

    What, no Faraday Rotation?
  10. VK7HH

    VK7HH Ham Member QRZ Page

    Proof is in the pudding. I'm hearing 2500km (1500 mile) signals on it right now. Shock, it works! Also, where is the reference that the Wikipedia article is referring? I'd like to look it up

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