How huge? Aviation uses HF (shortwaves) and not VLF as a backup for translatlantic flights (see for example https://thepointsguy.com/guide/how-pilots-communicat

How huge? Aviation uses HF (shortwaves) and not VLF as a backup for translatlantic flights (see for example https://thepointsguy.com/guide/how-pilots-communicate-with-atc-in-air/ https://thepointsguy.com/guide/how-pilots-communicate-with-a...). HF antennas can already look huge ;-)