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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GXDWKFOWPY6SWQOHTMPCXFNDPZJWQGGI/?format=api",
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    "message_id": "[email protected]",
    "message_id_hash": "GXDWKFOWPY6SWQOHTMPCXFNDPZJWQGGI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ICRAEUHQV7EZRA4RNBBCPWJSILTDWIRN/?format=api",
    "sender": {
        "address": "cathryn (a) junglevision.com",
        "mailman_id": "b22791281e9a40eda1243921964c14bf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b22791281e9a40eda1243921964c14bf/emails/?format=api"
    },
    "sender_name": "Cathryn Mataga",
    "subject": "Re: [amsat-bb] When exactly is a non-conductive mast necessary?",
    "date": "2019-12-31T00:55:16Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/USUATMFPW6EXRH3KAHLDQMRHI74SSSOE/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7P3M33U7FMNL2TVYLMP6NETYUCZTVQDL/?format=api"
    ],
    "votes": {
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        "status": "neutral"
    },
    "content": "Oh, thanks guys. This is eye-opening.  It looks like even circular \npolarized antennas will work with metal masts, if you rotate them 45 \ndegrees.\n\n\nOn 12/30/2019 2:31 PM, Gary wrote:\n> The short answer is almost never. Here is a link to an AMSAT Symposium paper form antenna guru Kent Britain, wa5vjb (inventor of the famous cheap yagis). He actually measured the effects.\n> http://www.kk0sd.net/metalboom/metalboom.htm\n>\n>\n> 73,\n> Joe kk0sd\n>\n>\n> -----Original Message-----\n> From: AMSAT-BB <[email protected]> On Behalf Of Cathryn Mataga via AMSAT-BB\n> Sent: Monday, December 30, 2019 3:27 PM\n> To: [email protected]\n> Subject: [amsat-bb] When exactly is a non-conductive mast necessary?\n>\n> I'm trying to understand, under what circumstances is a non-conductive mast necessary at VHF/UHF frequencies. Thinking of the following installs.\n>\n> 1.  Circular polarized antenna mounted to the mast at the center of the boom.    This is clear, see this advice all the time, fiberglass mast.\n>\n> 2. Same antenna but mounted at the rear end of the boom.\n>\n> 3.  Vertical Yagi, elements parallel to a vertical mast, mounted at the center of the boom. I guess, non-conductive wold be required here.\n>\n> 4.  Same antenna but rear mounted.\n>\n> 5.  Horizontal Yagi, elements perpendicular to a vertical mast, mounted at the center of the boom.  I think this is pretty normal install, so a conductive mast would be okay?\n>\n> 6. Same antenna but mounted at the rear of the boom.\n>\n> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n",
    "attachments": []
}