I tried installing it just the way you did it. But my antenna is shorter and when I analyzed using VNA kit, I got very high SWR. It was because the antenna is very close to the metal body of the car trunk.
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So I had to move the lip mount to the plastic portion of the trunk just next to the brake lights.
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Do you have a VNA kit? What's your SWR on your setup? u/DrewWith2DoubleYewz
find a HAM RADIO guy. he might have some toys that include a radio frequency analyzer and have the rest of the stuff to and knowledge to use it..
https://www.amazon.com/50KHz-900MHz-Analyzer-Measuring-Parameters-Standing/dp/B07Y53RCKW/
are you in orange county california.
there are some cars that get off the freeway next to my cardboard box that jam my bluetooth and wifi.. so you may not be imagining..
Please use clean amazon links.
https://www.amazon.com/50KHz-900MHz-Analyzer-Measuring-Parameters-Standing/dp/B07Y53RCKW
I have a MFJ Antenna Analyzer (don't remember the model number off the top of my head). I see a number of people are buying and using ones like in this link. It seems these have pretty good reviews.
Get a NanoVNA. Costs about $50 USD. You can upload data to a file and deal with it from there.
I looked further into it because of this comment. I was uninterested before because all the SWR meters I saw in my quick search were ~$50 and would only work on VHF/UHF bands, meaning I'd need to buy something else if I later built antennas for HF. But after this comment I found this guy:
https://www.amazon.com/50KHz-900MHz-Analyzer-Measuring-Parameters-Standing/dp/B07Y53RCKW/
All the antenna analyzers I see talked about in older threads on this subreddit are well over a hundred dollars, but this one seems to work on all ham frequencies for $60? Is this just junk, or has the price for a reasonable analyzer dropped precipitously? If I can get something that will also work for HF it may be worth it.
I assume there is some pretty big variety in the quality. Here is the exact one I bought (because it was on Amazon Prime):https://smile.amazon.com/gp/product/B07Y53RCKW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
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I haven't had any complaints yet (other than I lost the short USB-C cable.... need to buy another one dangit)