I haven't found any that really helped me, but some other people here have had better experiences. Maybe they'll chime in.
As far as measured reduction in radio signal inside the canopy, the one I have that really works is made from uncoated aluminum screen that I bought at Lowe's and 'laced' together with galvanized steel bailing wire. (It's six-sided, i.e. it wraps around under the mattress.)
If you want to reduce low frequencies like 60 Hz, you need a steel enclosure and it's likely to be heavy and a little pricey (~$200 US for the thinnest sheet metal).
Hello Alex, I'm sorry that I missed your question from several months ago about shielding canopies.
I have used an Aaronia Shield canopy as has my daughter and a friend. We believe that it has saved our lives.
My daughter had a smart meter installed on a bedroom wall and it appeared to be a collector meter which directly communicated with a single antenna tower nearby (witnessed this interaction with Gigahertz Solutions devices). Inside the house was the most horrible feeling of EMF assault ever while there were no wireless devices or electrical problems inside. I have been in numerous houses with smart meters which did not have this effect.
She was diagnosed with Lupus within a month of the meter installation. Pain so severe that she could barely get out of bed. Had no such pain prior to this and was a workaholic. Within in two weeks of sleeping under the canopy she stopped taking Lupus meds. She had no more Lupus symptoms, and said she couldn't wait to crawl under that canopy everyday. She soon moved out of that house into a safer environment. Eight years later she is still healthy.
Since I'm in a safer environment now, I now use the canopy whenever I travel along with a lightweight collapsible PVC pipe frame. Without it I cannot sleep in hotels - and sometimes still cannot because of elevated magnetic fields which is a different problem than RF. The canopy was an absolute must when I lived in a high EMF house and stopped the heart palpitations and restored my sleep. A highly ES friend has used one every night for nearly ten years since becoming affected, and she was the one who sold me on trying the canopy.
Some people use a Swiss Shield canopy which doesn't have the blocking power of the Aaronia, but they swear that it has helped a lot. I have a large piece of Swiss Shield fabric which I place around me when in a high EMF environment and it gives immediate calming relief.
I had found an Aaronia canopy offered on Ebay for a fraction of the cost. They are expensive - I used the shielding mat under the bed also and made sure that the canopy hung so that it touched the mat on all sides.
I wish there were more responses here from people who have tried canopies, but it seems that many have left for the Facebook version of this group, so you might check there. Best wishes!