Will aluminium have an effect on antenna?

I am planning on making a sun shade for my tablet and I have some thin lightweight aluminium sheet spare. Was wondering if it would have any effect on the signals from/too antenna? It will have a wide slot cut out of it so it won’t actually be covering them.

It May even improve it :grin:

It can reflect, deflect, alter the beam pattern and all kinds of unpredictable issues.
Even leaving a cutout won’t really help as you’re creating reflections and overlapping interference patterns in the uncovered area.

Basically, don’t use Alu.