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There used to be no better DX source than sitting in your car and tuning around the stations on its radio to see what was coming in. Cars used to have some of the best radio reception, as many here may recall.
We now live in an era where AM may not even be an option, and if it is, it may not be what you remember. I haven't really tested my new car's reception after dark, but I should make a point of it to compare it to my old one, which could pull stuff in from all over.
All of which serves as a longwinded introduction to the article below, in which one of my favourite writers - a guy based in San Pedro, California - tested a few different "new fangled" antennas in his truck to see which worked better. It may not surprise you that those old long metal antennas, which really aren't used any more, worked the best. As for that little rubber thing that sticks out of the roof on many new cars?
Well, here's what he found in radio-rich Southern California.
Testing out the next generation of antennas to see what sounds best
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My 2020 Equinox has just a little nub of an atenna on the roof. It doesn't have any wertical component like a rubber duckie. It works well for SXM and FM, but it's pretty useless for AM.
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Does anyone remember when automobiles had the antenna installed in the windshield? The first time I experienced this was with my dad's chocolate brown 1972 Chevy Biscayne. I don't recall whether the antenna was better than the one in the 1967 Biscayne. I could still get WLS, WCFL and WABC loud and clear at night. That's all that mattered to me back then.
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I remember those. They were pretty lame.
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My dad's 1974 Cutlass had one and it worked just fine.
You could even see the wire going through the glass of the windshield.
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If an FM signal you were listening to was horizontal polarity only, the windshield antenna would have beat a vertical. By the 1980's most stations were both vertical and horizontal, so the advantage wasn't there anymore. I recall them being a little bit directional on FM so reception would sometimes vary a little bit when you turned a corner. On AM they worked, although I don't remember if they were equal to a vertical or not.
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Question since were on the topic of cars, why does reception get better when im on the highway vs off the highway. This can happen even outside of the city. Is it because its more elevated perhaps and "open space"? FM im talking for here.
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I noticed that on the 402 between London and Sarnia. Open space towards the radio stations transmitter site would be the most likely explanation. Another location where you encounter this is near railroad tracks.
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markow202 wrote:
Question since were on the topic of cars, why does reception get better when im on the highway vs off the highway. This can happen even outside of the city. Is it because its more elevated perhaps and "open space"? FM im talking for here.
Broadly speaking, due to the frequency 88 - 108 mhz FM broadcast signals are typically 'line of sight'. This means once they leave the transmitting antenna they flow toward the horizon. Now factor in the curvature of the earth and eventually the signal will meet the horizon and carry no further. In the city even strong signals can bounce off hard objects like structures and arrive at the receiver's antenna sort of slightly delayed. This can cause 'picket fencing' or drop outs, fluttering, snorts, and noise. Out on the highway there are fewer obstacles that cause this. Generally the height of the transmitting antenna as well as the radiated power will dictate the station's range.
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The last two cars I’ve owned have had terrible antennas. I remember driving on Sheppard Ave in Toronto near the 404 with my old ‘08 Chevy Cobalt, and getting terrible reception for both 102.1 and Q107. Though I did manage to get good reception for some London stations from Northeast Ohio with that car once.
I drove a 1997 Chrysler Intrepid back when I lived in London, and it had a decent exterior antenna. I could regularly get Detroit FM clearly, particularly WRIF and WOMC.
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darcyh wrote:
markow202 wrote:
Question since were on the topic of cars, why does reception get better when im on the highway vs off the highway. This can happen even outside of the city. Is it because its more elevated perhaps and "open space"? FM im talking for here.
Broadly speaking, due to the frequency 88 - 108 mhz FM broadcast signals are typically 'line of sight'. This means once they leave the transmitting antenna they flow toward the horizon. Now factor in the curvature of the earth and eventually the signal will meet the horizon and carry no further. In the city even strong signals can bounce off hard objects like structures and arrive at the receiver's antenna sort of slightly delayed. This can cause 'picket fencing' or drop outs, fluttering, snorts, and noise. Out on the highway there are fewer obstacles that cause this. Generally the height of the transmitting antenna as well as the radiated power will dictate the station's range.
I experience this the most up north with 103.3 FM Moose FM Parry Sound. Now while im listening still at a decent distance away from the transmitter (Port Severn) the minute I get off the highway and onto the sideroad the signal gets pretty crummy. Fading in and out. Unable to receive under any bridges. This doesnt get much better until your almost to Parry Sound area close to their transmitter and its not weak eitheir. Highway, perfectly fine.
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Sometimes its also not just the antenna, it can be the tuner in the radio itself.