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Diamond X510HDM Station Upgrade

Discussion in 'Amateur Radio Antennas' started by Moleculo, Apr 7, 2021.

  1. Moleculo

    Moleculo Administrator
    Staff Member

    Apr 14, 2002
    Likes Received:
    For many years, I've been using the Gizmotchy 4 element 2 meter antenna along with a Discone antenna for 2m/440 TX/RX. With my back against the local mountains, my 2 meter SSB options were limited and I decided a long time ago that operating that 2m ssb at the QTH was a limited affair. Since most of the repeaters I talk on are on 440, I decided it was time to rethink my VHF/UHF situation and upgrade antennas. Down came the HF vertical on top of the roof, and up went the Diamond XD510HDM 2m/440 vertical antenna.

    diamond X510HDM.jpg

    As far as VHF/UHF antennas go, this things is a beast, but it is supported easily on top of the 30 foot push up mast. It's 17 feet tall and is composed of 3-5/8 wave elements on 2m and 8-5/8 wave elements on 440. Gain is advertised at 8.3 and 11.7 db respectively.

    My QTH elevation is about 800 feet, which is good elevation above much of Los Angeles and Orange County. The feed point of the antenna is at 42 feet. With this antenna, I can finally work most of Southern California on both bands with a barefoot radio. The upside is that this antenna will handle 300+ watts on 2m, so if I really want to work someone in the distance, it can handle the 200 watt Mirage amp, as well. This antenna just breathed new life into my VHF/UHF station!


  2. chris schaefer

    chris schaefer New Member

    Feb 9, 2021
    Likes Received:
    what coax cable do you use??
  3. avistar23

    avistar23 Active Member

    May 17, 2005
    Likes Received:
    can you sweep the swr into marine VHF area?
  4. Jay Mojave

    Jay Mojave Well-Known Member

    Nov 17, 2015
    Likes Received:
    This looks like a good choice antenna for camping and doing the Jeep Run communications for the Jeep Club. I have a box type trailer that carries mass quantities of fire wood and unnecessary crap. But all the masts, antennas, coaxs, and ladders are placed on top of the box trailer and tied down. So that antenna would work for me thanks Moleculo.

    Jay in the Great Mojave Desert.... "Next Gas 150 Miles"

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