Really got me wondering about that. I have a vocal booth between me and the neighbour who complains that he can't get wifi properly off the communal router. I thought maybe I'm to blame since I built that thing last year but I just realised that I sometimes sit behind it in the bathroom and it gets through fine. Had me for an hour there though.

 

I have a room full of basstraps no wifi problems.
basstraps are broadband for sure.
Out of topic: I switch it off when I record at 88.2 or 96 kHz

 

But more easily...
If i cover this with classic acoustic panels? for example with 30kg/m^3 of pyramidal panels and put around me and my desk and monitors?
Does it damp my basses and solve problems even partially? I noticed that in a corner where I put a curtain I haven't any basses problem...

 

I did some large scale building projects, including a studio.

For bass absorption, you need at least 35 kg/m3 density stuff. More is better, but no need to overdo it. Preferably 100 mm boards, not rolls. 60 mm is possible if space is constrained, but needs more surface. Boards are easier to cut to size and attach. They also give far less fiber into the environment. No need to cover, but a very thorough cleanup is needed after construction.

Also, fiberglass is far more irritant than mineral wool. It's very irritating to the skin, mineral wool isn't as bad.

We've never found foam that could work as a bass trap. Despite consulting with most of the foam manufacturers, nothing came up that was even comparable to mineral wool price-wise. The typical pyramid stuff is a low-cost packaging material, sold too expensive. As an acoustical dampening material, it's next to useless.

Besides, for acoustic treatment, you need open-cell foam. Closed cell foam will work as a reflector.

Covering up any bass absorbers in plastic, is acoustically plain wrong. It will produce reflections and it will lessen the dampening. If you feel like covering the absorbers, use open textile, like used for loudspeakers. But any open textile will do. In the public performance area we did, we had to prove less than 5 ppm parts in the air, but also on the floor, after opening. These absorbers were part of the wall and had no covering at all. Measurement showed 0,05 ppm, which is much cleaner than your average open air.

Diffusers can be the cherry on the cake if your absorption is done right. In a small home studio I can't see the need, tho.