I actually have purchased a repeater kit from unwiredsignal.com
it only cost me like $675 with shipping... I also had a 30 day money back guarantee.
I had a good signal outside 3-4 bars but in my home I had no bars. (having a metal roof didn't help me any.) After receiving the kit and setting it up, when I turned it on I now have full bars through out my home.
It works for my air card and our cell phones!
The kit I purchased is the Wilson DB Pro 841262 Booster- Repeater Kit
its dual band so it works for all providers except nextel
. I also got rid of my land line so the kit will eventually pay for itself.
BTW I tried the zBoost, I had to be 4-5 ft from the inside device for it to actually work... You get what you pay for. In this case I got my money back.
Best advice I could give you, check it out, do your research
, look for good customer service
and make sure there is a money back guarantee
just in case because there are companies out there that will just sell you something to make a sale and afterwards you cant even get in touch with a real person to ask questions.
Also, check review and testimonials... that is something I didn't do the first time around.
Hope this helped