The little life insurance for the receiver. The Antenna Safe Disconnect switch from Jan Šustr QRO.cz. It is connected between the antenna and receiver (suitable adapters are also available from Jan if you are not using SMA connectors) and then switches the antenna to earth via 12 V when not in use. For 70 euros, this is a very sensible purchase to prevent static charging and discharging from the antenna to the receiver.
https://hamparts.shop/antenna-safe-disconnect.html