Let me start by saying I was skeptical about these antenna enhancer stickers from the get-go. The idea that a simple sticker could improve my phone's signal sounded too good to be true, but I decided to give them a fair shot.
First, the installation was indeed easy - just peel and stick inside the battery compartment. I tested them on three different devices: my smartphone, an old walkie-talkie, and a cordless home phone.
On my smartphone, I noticed maybe a 5% improvement in areas with already decent coverage. Pages loaded slightly faster, but in low-signal zones (like my basement), they made zero difference. The walkie-talkie showed no noticeable improvement at all.
The biggest disappointment came when testing them in rural areas far from towers - exactly where you'd hope they'd help most. No change whatsoever in signal strength or call quality.
While they didn't harm performance, these stickers definitely don't live up to their claims of significantly boosting reception. Save your money for a proper signal booster if you really need better coverage.