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Thread: One antenna or four?

  1. #21
    Maximum Bitrate stonestatue's Avatar
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    Also, I was looking into this:

    http://cgi.ebay.com/NEW-MOBILE-SCANN...QQcmdZViewItem

    It "adapts" the FM antenna already on most cars and allows it to be used with a scanner as well as the FM radio.
    Check out my GMC Savana worklog.

    Remaining tasks to facilitate vanputer installation codename "Enterprise":
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  2. #22
    Maximum Bitrate stonestatue's Avatar
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    Nevermind the evaluation of the FM radio splicer. I checked out some reviews of it in an antenna forum, and they weren't favorable. I did find this link on the same forum though:

    http://www.sti-co.com/antenna-produc...band-antennas/

    This is a covert antenna designed to be used with police radios and FM radios.

    http://www.sti-co.com/antenna-produc...ntenna-system/

    This one is an antenna inside PVC pipe designed to be used as a luggage rack bar. Since I have a van, this would blend in perfectly.
    Check out my GMC Savana worklog.

    Remaining tasks to facilitate vanputer installation codename "Enterprise":
    - Edit skin to liking.
    - Get compatible phone for mobilephone.net.
    - Facilitate HVAC control.

  3. #23
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    Be careful about putting multiple antennas that close (ie inside that pvc tube). For one, horizontal polarization for most transmitter omnidirectional antennas is BAD. Two, you put two antennas that close together, and you can have disasterous results for both radios. It would be alright for the scanner alone, but why bother? A big white (or you could paint it i suppose) pvc pipe mounted on the roof of your van is going to be just as conspicuous as a 15" tall scanner antenna, and you still need the other mounts for your CB and ham radios. I'd just use a cheapo rubber FM antenna from an auto parts store for your FM radio. They mount on your front fender and work pretty well. You would need to drill a 1/2"-7/8" hole depending on the antenna.

  4. #24
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    Mount this antenna http://www.www.premiere-electronics.net/store/mor.html on the fiberglass roof for the scanner, and route the coax however you need (it only includes 12 feet, so keep that in mind). Scanners dont need a ground plane.

  5. #25
    cheap custom title JC-S60's Avatar
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    Why not mount a metal plate (very thin) of 1 by 1 meter (or bigger) underneath the fiberglass roof and ground it to the body? Then mount your antennas on the roof (through the metal plate).

    That will give the best performance and will look best...

    Just an idea...

    Good luck,
    Joachim

  6. #26
    Mac Car Moderator kandyman676's Avatar
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    Quote Originally Posted by stonestatue View Post
    Is that a good thing or a bad thing? Either way... I don't guess I mind the ability to scare people...
    Nah, he would need to black out the windows, paint it white, and mark on some really fake company name. THEN be scared :-)
    "If it works this good why F with it?" -KMFDM "Intro"

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  7. #27
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    a good ham radio (10 meter) that can be converter to cb as well is an RCI 2970 or similar. The new cool thing is the UHF ham band. small antenna and lots of fm channels.

  8. #28
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    The said metal plate will NOT be a good RF ground. It would perform similar to slapping a mag mount on a cookie sheet. Ideally, your vehicle would be one continuous piece of metal, no hinges or gaps or un-welded joints. Electrical ground and RF ground are not the same, thats why you need to ground your doors and hood to the body using ground straps, either pre-made or make your own from old RG-8 shield braid, not ordinary wire. You want to ground the exhaust at both ends to the vehicle chassis. Extra battery to body grounds are good for reducing alternator whine..Run the power and ground leads for your radio(s) straight to the battery, dont ground it to the body, and DEFINITELY don't use the lighter plug. Thats asking for interference, both rfi and tvi.

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