My radio signal has become very bad recently. Seems to be worse in colder weathers.

I want to check the Antenna amplifiers but cant find any posts about their location.
Can anyone confirm?

Any workshop diagrams or pictures to help?

If its the DAB, mine is intermittently rubbish, so much so that I've gone back to FM.

DAB has always been pretty bad, but no its FM (and DAB)... FM can just have intermittent crackle to no signal at all.
Something has definitely degraded a lot over the past year.

Any ideas where the amps are located on L494 RRS?

They're attached by brackets to the upper tailgate area, you need to remove the rear spoiler and then you will see them, from what I recall the AM/FM one is on the left hand (passenger) side.

You can identify at the following: -

https://store.landrover.com/parts/index/pa...and-rover/

Look at callout 19G255A, maybe check the earth straps to the tailgate hinges, as the tailgate is plastic there's no natural body earthing.

Good luck!