How to get good signal strength in skyscraping neighbourhood?

In my opinion you should go in for a cell phone booster for signals. getting one could solve your problem to a great extent.the cell phone booster by cellular innovations ABOOSTER can do much by a Universal Antenna Booster that Fits behind any battery. it comes with a 1 year warranty, it uses radio distribution equipment that enhances, extends or amplifies a wireless signal but it may be prohibited without the consent of the wireless carrier upon whose network such equipment will be used, so you need to check in with your carrier first. however it comes for around $9.99 but on websites amazon.com,you may find some discount on the service. another such item could be from Wilson Electronics made MobilePro Cell Phone Signal Booster with Magnet Mount Antenna i.e suitable for Multiple Users ,some of its benefits include Amplifies Signals to and from the Cell Site. it is being controlled by a Microprocessor, its Circuitry Ensures stable Operation within Regulations , the Amplifier Features built-in Antenna and Mini Magnet external antenna ,could be Installed within minutes , another benefit is of it being Portable to move from Vehicle to Building. Dual-Band Cellular Amplifier with Wireless Connection for Voice & Data ,Extends Signal Range & Increases Data R, Greatly Reduces Dropped Calls , as they say it is World'S First Vehicular Cellular Amplifier and you can have it for $159.99.