The antenna from FA is much better than the indoor antennas.
https://www.amazon.com/gp/product/B00WZL6WPO?tag=fligh01-20
You’ll have to get appropriate cabling as well.
I’d recommend any of the following offerings:
3’ Coax: Amazon.com
10’ Coax: https://amzn.to/2H2oFQX
15’ Coax: Amazon.com
25’ Coax: https://amzn.to/2KygcXD
36’ Coax: Amazon.com
50’ Coax: https://amzn.to/31xFkDM
By the way there is no “Flightaware amazon kit”, those are different from supplier to supplier, FA does not offer any kits.
Anyway if you don’t want to spend the money, you can significantly improve your current antenna by cutting it to the correct length:
How to improve performance of whip antenna of DVB-T