This is the kind of antenna placement and tweaking needed to get great results from the SureCall (or any other) cell phone signal booster

And, so far, I have many, many positive results of how effective this booster is, according to my situation

If they aren't far enough apart or they are oriented in such a way that their signals can cause interference with each other you're not going to get good results.

Does increase signal as advertised, but does require researching use and cellular tower locations as well as other factors to get best results.

Update - Dead T-Mobile registration links still found in setup guides online from several sources

To bad t-Mobile support could not provide it over the phone.