You may have seen them: Little high-tech-looking stickers, something you stick on or near your cellphone's antenna.
3) I've had several conversations with people about these antenna amplifier stickers, and many told me they don't work.
4) If supposedly honest retailers won't take the responsibility to verify their products actually work, the job is up to us. It's advertised that cellphone antenna booster stickers improve cellphone reception and call clarity by boosting the signal reception of the phone.
Drive to multiple locations around the city (I drove to nine different locations encompassing a forty-mile radius of my home), All locations were places where most of my phones' signals were not at full strength. 3) Keeping the phone in the exact same position, perform step 2 with pouches 'B' through 'E'. For those interested in the numbers (including the signal measurements for each phone at each location with each pocket), here is the raw test data in PDF format. If the antenna booster stickers really work as advertised, they should be performing noticably better than our control group (B).
Some sites reference a case study and report by Kodbins, indicating antenna booster stickers work.
The 'antenna booster' stickers that have been predominately advertised as a cell phone accessory that 'will improve your signal' and as one manufacturer has claimed 'gives you the equivalent of an 11 foot antenna,' certainly look like they have the same kind of technology used in modern cell phone antennas, and that may or may not be true. In the case that these stickers are actually designed to resonate close to the frequency of your cell phone then placement of the sicker would be vital.
In the case that the stickers don't resonate anywhere close to the frequency your cell phone uses, then the interference caused by the sticker would be greatly reduced.
Not to state the obvious, but simpler techniques might give an average user better reception.
Based on my testing, and the antenna theory as presented by the experts, cellphone antenna booster stickers do not work as advertised. Antenna booster stickers are supposed to improve your cellphone's reception, leading to clearer conversations and fewer dropped calls.
One example was a TV reporter talking on a cellphone, then slapping a sticker on his phone. As advertised, the booster stickers can be shown to work by viewing the signal strength of a cellphone.
I emailed a booster sticker seller, asking for more detail on the information and proof presented so prominently on their website.

The company has no website, and the only information I could find on them was at this page. A longer antenna does not give you better reception when compared to one exactly tuned to the frequency you are trying to receive, and since it [the antenna booster sticker] isn't electrically connected to the radio inside your phone then it shouldn't matter anyway. If the sticker was placed exactly right in relation to the cell phones antenna then it would act as a reflector, making it a antenna directional (think satellite dish), and the cell phone would have to be oriented in the correct direction to make a call. The theory is that a straight antenna tuned for the exact frequency range used in that cell phone's operation would work better than a small dual frequency antenna.
Observe just how much man-made and natural matter might be in-between your cell phone and a cell phone tower. But the sad fact is that enough people are buying these types of products to keep companies successful for years. This is so the tester has no idea what was in each pocket, forcing all tests to be unbiased.
I would've liked to have more, but this sample set is still large enough to show a trend: The antenna booster stickers just don't work. Note that 1) they make the technology they're testing, hardly an independent, non-affiliated test, and 2) the company did not respond to attempts at communication. If incorrectly placed, the sticker would resonate at the phones operating frequency and become a source of out of phase waves that could either drown out the original signal, or cancel part of the signal, out making it effectively smaller than it would be otherwise, depending largely on the distance from the antenna the sticker is placed. In practice, the antenna performed admirably and greatly increased the operational capabilities of the phone it was mounted on.
Note that this is for a Verizon phone, and as such is the longest example of portable dipole antenna at just barely over 7 inches long. Radio waves do not travel as well through concrete, iron, trees, stone, and dirt as well as they do through air. Look at the number of companies who feature antenna booster stickers - a quick Google search gives plenty.
This is a worthless test, not scientific, and is television media disrespecting their audience and dropping their own responsibility for intelligent analysis. The tester will have have no idea if what's being tested are the booster stickers, tin foil, or nothing. In one case (with the Treo 700p), the result is probably due to normal signal strength fluctuations - if the sticker was truly working, then the second sticker (C) would also have performed well. For those who want technical information about how antennas work, and how cellphone booster stickers don't, read on.

Although your service provider might use only one of these frequencies (or all four!) cell phone manufacturers have to make antennas that will perform equally well on all the frequencies available to the service provider. Because your cell phone is a two way radio the sticker would also negatively affect the transmission properties of your phone by simultaneously adding resistive, inductive, and capacitive impedance to your outgoing signal (translation: smaller transmitted signal).
More recent phones I have owned have had stock antennas that performed just as well as the custom antenna I built. By making the radio waves go through as little of these obstructions as possible, your signal will greatly improve.
Having a society where one can sell almost anything (without any proper verification of claims) gives an undeserved level of legitimacy.
It was odd that people were willing to bash the stickers, but not willing to go on the record.
In order to have a voltage, one part of this wave must be measured against a different part of the same wave. In order to accommodate all these frequencies, and to make the antenna small enough to fit inside a phone, the antenna is designed by a sophisticated computer program that calculates the twists and turns necessary to get the best reception with the space allowed. I want to warn people of such scams, of how the antenna stickers don't perform as they claim.
Also, the gap between first and second place was .11 signal bars, well within the top of the standard deviation bell curve.
In the case of a radio antenna, the conductor takes the peaks of the radio waves and measures them against ground potential. This antenna is made from etched copper on a piece of flexible plastic and then electrically attached to the sensitive radio in your cell phone.
This, to my knowledge, is the only randomized, double-blind, placebo-controlled test of antenna booster stickers. I ran the tests, but have people much smarter than me talking about antenna theory and radio physics, explaining scientifically why antenna booster stickers don't work as advertised. If you look at a sin wave the biggest vertical measurement possible is from one peak to the peak on the negative side. The radio inside a cell phone then also further isolates the frequency and amplifies this voltage measurement and turns it into sound or data.

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