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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P7IBLQ4MZSGS7FGEMBJUCKSDJILTH734/?format=api",
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    "message_id": "CALx_moT8-CRXo8fHTh1DcApDWhKQoB-s0CFK3=_p_VVxGKZzLw@mail.gmail.com",
    "message_id_hash": "P7IBLQ4MZSGS7FGEMBJUCKSDJILTH734",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ICRAEUHQV7EZRA4RNBBCPWJSILTDWIRN/?format=api",
    "sender": {
        "address": "tnetcenter (a) gmail.com",
        "mailman_id": "05366e6d2c0a49ddb2ff91e355667842",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/05366e6d2c0a49ddb2ff91e355667842/emails/?format=api"
    },
    "sender_name": "Jeff Moore",
    "subject": "Re: [amsat-bb] When exactly is a non-conductive mast necessary?",
    "date": "2019-12-31T02:19:45Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/USUATMFPW6EXRH3KAHLDQMRHI74SSSOE/?format=api",
    "children": [],
    "votes": {
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        "status": "neutral"
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    "content": "I'm sorry - that's way too general of an answer to be accurate.   Physics\nsays it's impossible to stick a significant piece of metal in the near\nfield of an antenna and NOT have an effect!   The only valid question is\nHOW MUCH OF AN EFFECT THERE WILL BE!\n\n7   3\nJeff Moore  --  KE7ACY\nCN94\n\n\nOn Mon, Dec 30, 2019 at 2:32 PM Gary via AMSAT-BB <[email protected]>\nwrote:\n\n> The short answer is almost never. Here is a link to an AMSAT Symposium\n> paper form antenna guru Kent Britain, wa5vjb (inventor of the famous cheap\n> 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\n> 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\n> 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\n> 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\n> 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\n> the center of the boom.  I think this is pretty normal install, so a\n> 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\n> all interested persons worldwide without requiring membership. Opinions\n> expressed are solely those of the author, and do not reflect the official\n> 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> _______________________________________________\n> Sent via [email protected]. AMSAT-NA makes this open forum available\n> to all interested persons worldwide without requiring membership. Opinions\n> expressed\n> are solely those of the author, and do not reflect the official views of\n> 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>\n",
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}