I thought I would share my experience so far after a period of over a months use of the radiation shield. I was a bit doubtful when I first got it, because the thing is so small, I thought there was no way this would do the job, but now that I have tested it for a while, I really like it. I like the fact that it seems to get plenty of air circulating inside it, enough so that the daytime highs are 1 degree cooler than the 5 in 1, (sometimes 2 or 3) and humidity readings are much quicker to respond than they were inside my large homemade shield. I do notice as the sun rises in the morning, my temp reading is higher than everything by sometimes 4 or 5 F, but then it levels off and others catch up and pass me. This is in full sunshine all day. At night, mine cools down faster than everyone also.