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Originally Posted by santosh.s  tsk, that was pretty useful information!
A couple of questions are still open though...
1. Reflections. I know high end receivers from pioneer, jvc have dedicated circuits in their tuners to filter them out. But was wondering if there are any related tips regarding the antenna itself. |
Dipole antenna's/ Yagi antennas etc., There are ways, not too practical on a car. I could google you some guides with mathematics etc., but it wont be very useful in a car scene. You have to live with it, but don't worry, inside the city the signal is pretty strong. Anyways check out J-Pole google for it, there are DIY J-Pole antennas possible, but they are a little unsuited to mobile platforms
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2. Polarization. does it matter? was wondering if that would call for any additional care to be taken in antenna orientation. Hope not.
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I should hope not, most stations broadcast left or right circular polarized signals right. For city use, I doubt that it will matter. Different stations have different settings, so if you were living 200kms away and wanted to listen to a particular station, you can go ahead and design that perfect antenna, but then in a car, everything you will do will be useless as the orientation and placement of the vehicle will change things.
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That obviously means that reception will be worst in minimum gain position. I thought that it will be even worser than a short wire, no? For example, if you are driving in city outskirts, reception will be good if station happens to be right in front of you or back side. But it will be bad when the station is exactly on either left or right side.
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You will have a wire running from HU to the antenna right? That will suffise + you will get some gain from the dipole antenna. Moreover in the city there are reflections etc., also. Even the very incorrectly designed 1 feet long dipole windshield antenna works, right, this will work much better.
You can read up this if you want to look at more research
A Circularly Polarized FM Antenna for the Attic Antenna (radio - Wikipedia, the free encyclopedia)
I am pretty out of touch as far as nitty gritties are concerned.