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Author Topic: 2 meter antenna  (Read 1385 times)
KF7ITG
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Posts: 115




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« on: February 26, 2017, 11:57:57 PM »

I'm installing a FT 2900r in my RV for APRS. The top of my RV is 13 feet. Highway overpasses are 16 feet. I have plenty of room to install a six radial ground plain. My question is 1/4 wave antenna can stand vertically. A 1/2 or 5/8 would need to be tilted to clear bridge structures. A 5/8 antenna would require it to be at approximately a 45 degree angle. Any issues tilting an antenna that far over,

Thanks James
KF7ITG
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W8JX
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Posts: 12081




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« Reply #1 on: February 27, 2017, 06:08:06 AM »

I would use a 1/4 wave and not a sloped 1/2  or  5/8 wave as that would reduce performance. A 1/4 wave up that high would work pretty good.
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Ham since 1969....  Old School 20wpm REAL Extra Class..
K9YLI
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Posts: 1194




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« Reply #2 on: February 28, 2017, 07:51:54 AM »

radiation pattern around an antenna element  is the shape of a do-nut.
Tilting the  element  45 degrees  also tilts the radiation pattern.
So you could communicate with  satellites in front of you and  coal miners behind you.
Yes ,, but I do   exaggerate....   
Still  thats a basic  idea.. sometimes confounded by  other factors such as surrounding structures, wires , element s..
  Vertical elements, horizontal elements,  slanted or angled ones.   
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