I would go with your 3rd choice.
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
It’s in the same price rage. It supports both 1090 and 978 MHz frequencies. (you need a simple y-cable and two dongles)
The folks at adsb exchange make these and they’re super well built, and they are sold at cost because they are just out to help people improve coverage and pick to the traffic.
I know the other response downplayed the two-radio configuration, but I’m doing it, and I’ve done it with and without the second dongle in play. The range is similar. What really kills my range is running the kit near to my MacBook with a USB-C HDMI connector. The interference that leaks out crushes my range.
This is similar to both above, not sure it ships free from Amazon to UK.
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
Either one will work. FA one requires you buy coax. Airnav one works but included coax is lacking.
No matter what you decide, the important part is ADSBx. :D
It works a lot better outside, but was reasonably workable just on a window ledge. There are a lot of factors, but that's probably in the 20-100 mile range, if combined with using a ~$10 appropriate antenna. (It does work inside, but it's hard to predict how well.)
On the better/max end, a nicer $50 antenna like https://www.amazon.com/dp/B089Q4BVCB mounted high on a roof is reported to get ~300 mile range in the right conditions.
Doesn't hurt to start small and experiment. Ideally it's fun too.
Also the feeder map, if you're curious how useful (relatively speaking, as more is always better) adding to a location would be: https://map.adsbexchange.com/mlat-map/
https://store.adsbexchange.com/collections/frontpage/products/5-5dbi-1090-978-antenna
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
ADSBexchange.com makes a nice antenna for the price. You need to use good coax, LMR240 for 25 feet and LMR 400 for above 25' to about 75'
Look here:
If you really want to DIY - and not rely on an external service, you can get an 1090 MHz antenna and a USB SDR dongle, like this FlightAware ProStick. That will allow your computer to directly receive the signals from planes in real time and make it much geekier. From there, you can filter the feed for a distance and general direction, and bingo, you've got your setup.
If you are US based then the ADSBexchange.com 1090/978 is the way to go.
Amazon Prime: https://www.amazon.com/dp/B089Q4BVCB
Direct: https://store.adsbexchange.com/collections/frontpage/products/5-5dbi-1090-978-antenna
SDR : SD card combo
https://www.amazon.com/ADSBexchange-com-RTL2832U-Software-Industrial-MicroSD/dp/B09F2ND4R6/
How to feed:
https://www.adsbexchange.com/how-to-feed/
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That being said, DPD makes professional antennas.
Just an antenna tuned for more then 1 frequency, I use the ADSB Exchange one. https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
Next you just need a splitter right before the 2 SDR, I’ve had good success with this one.
https://www.amazon.com/Hyuduo-Splitter-100-2700M-Frequency-Combiner/dp/B07QPZSSGF/
Few small jumper cables, and you can put the filter on the combined cable, it passes 978, or you can use it after the splitter to do only 1090 side.
I appreciate the list. As more money becomes available, I'm going to look at upgrading the antenna. I do like this on no your list:
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB
I'll just need to convert from an N connector to the SMA on the receiver.
:D Indeed.
Upgrade to ADSBx image, use readsb, and tune your feeder gain for more better fun! You can still feed FlightAware by installing PiAware client <vomit> ....
https://www.adsbexchange.com/how-to-feed/
Or just add ADSBx to your currentfeeder and get that sweet sweet unfiltered MLAT.
ADS-B/1090 Feeder Script
Works on all known images from other flight tracking companies as well as DIY created Pi / Debian linux feeders. ADSBx will not break other images or feeders.
Running the following commands will download the contents of the repository and begin setup. You can find more info at ADSBexchange Github.
wget -O /tmp/axfeed.sh
https://adsbexchange.com/feed.sh
sudo bash /tmp/axfeed.sh
Verify your feeder is working, check: https://www.adsbexchange.com/myip/
To see your MLAT sync, check: https://map.adsbexchange.com/mlat-map/
BONUS:
Add a second SDR for 978 using the ADSBx antenna and image!
Dual band antenna:
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
​
https://www.adsbexchange.com/how-to-feed/adsbx-custom-pi-image/
If you want some help!
Discord!
Too much noise on the discone. Had the exact issue in the beginning.
You can get a real antenna that does both 1090 and 978 from ADSBx. There are 1090 only for more expensive.
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
You can also try putting a band pass filter on the ADS-B line before the SDR.
https://www.amazon.com/gp/product/B010GBQXK8/
It's normally $15, out of stock now. FA charges a lot for a $5 band pass but it works and they make bank off them
you maybe confused as to how it all works. decoders run on the Pi, then clients feed sites. these are independent, except for FR24 which tries to take of the Pi to purposely break other site feeds.
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https://www.adsbexchange.com/how-to-feed/
https://www.adsbexchange.com/how-to-feed/#customimage
https://www.adsbexchange.com/how-to-feed/adsbx-custom-pi-image/
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Use ADSBx image. Then install FR24 client only.
ADSBx Antenna does both frequencies.
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https://www.amazon.com/gp/product/B089Q4BVCB/
https://store.adsbexchange.com/products/5-5dbi-1090-978-antenna
To get the best range you need to mount antenna outside and use good coax. LMR-400 etc - depending on length of run.
The brackets are for a mast mount. Same as ADSBx antenna.
https://www.amazon.com/ADSBexchange-5-5dBi-N-Type-Female-Antenna/dp/B089Q4BVCB/
If you did attach to an exterior wall you could use your own screws. A lot of people attic mount them with as few zip ties.
1090Mhz ADS-B is vertically polarized, make sure antenna is vertical.