The Flightaware antenna is very nice. (https://www.amazon.com/gp/product/B00WZL6WPO?tag=fligh01-20)
This is a more expensive antenna: https://dpdproductions.com/collections/aviation-base-mobile-antennas/products/ads-b-vertical-outdoor-base-antenna
(The flightaware antenna should suffice for most people, but it’s all a matter of taste and money i guess )
Flightaware also has a blue receiver with builtin LNA (https://www.amazon.com/dp/B01M7REJJW?tag=fligh01-20)
It sometimes needs a filter in front to work better with strong mobile signals (https://www.amazon.com/dp/B010GBQXK8?tag=fligh01-20)
I would personally use this LNA (https://www.rtl-sdr.com/new-product-rtl-sdr-blog-1090-mhz-ads-b-lna/) together with their dongle (https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/)
There is some setup involved activating the bias-t to feed the LNA, but again if you can use ssh, it’s not hard at all. (https://www.rtl-sdr.com/getting-the-v3-bias-tee-to-activate-on-piaware-ads-b-images/)
If you want to go more expensive there is always an Airspy mini or a mode-s beast.
(In case of the airspy mini you could always get that later, it would work well with the rtl-sdr LNA)
Then you need some cabling, something like this to connect to the antenna: https://www.amazon.com/Low-Loss-Coax-Extension-Cable-Ohm/dp/B071DFQGXY
Keeping the cable not too long is advisable but with the LNA you can just get a second stretch of cable (https://www.amazon.com/Low-Loss-Coax-Extension-Cable-Ohm/dp/B00V73RFDO)
That should pretty much cover it.
For completeness i will mention there is also another LNA available (https://ava.upuaut.net/store/index.php?route=product/product&product_id=85)
There is even more things listed on flightawares page on builiding a receiver: https://flightaware.com/adsb/piaware/build
That page lists most of the stuff i just linked, be aware i just looked for the right parts not the best price when linking these parts.