An antenna MUST be a conductor in order work!
Put an ohm / continuity meter across these and they don't don't conduct! (in fact they're just a printed sticker!)
An antenna to be efficient, hence "boost" the signal must be in 1/4 , 1/2 or full wave length of your targetted frequency!
These claim to be for any and all devices, so by their logic ALL radios operate on a single frequency. ...so why can't I hear your 802.11b wireless network card on my cell phone.
... lemmings, lemmings, lemmings
'Each one has a lifespan of about 18 months'
what the imaginary battery runs out???