Anyone thought about the Alientech antenna for the SC, I cant see a full kit but I would think you buy this for the SC and an antenna of your choice from their site.

https://alienth.cn/products/alientech-pro-case

Looks impressive

Hi, thanks for sharing this accessory with us. For a friendly reminder, please be cautious about using third-party accessories as this may damage our unit and lead to warranty avoidance. Thank you for your understanding.

I use these on my normal controllers, I can easily fly 10 km (6.2 miles) with it, in open field.
In the city, where there is often a lot of interference, yet still convenient, 5 km (3.1 miles)

Whit this Booster
https://alienth.cn/products/alientech-5-8g-antenna-signal-booster-for-dji-drone-mavic-air-spark-phantom-4pro-inspire-2-m200-600

I've been watching how the guy disassembles the Smart Controller and assembles it again with the new antenna... Almost forty-five minutes, even knowing the steps. And, in the end,  he fixes all the screws...

It looks an awesome item but I wouldn't dare to do it. Too much for my skill...

that bit covering the leds,s, small plastic strip that he had a bit of bother with, I can see me snapping that knowing my luck