I have my office in basement and there I face a lot of signal problem. It is quite impossible for me to be in contact with any one when I am in office. Can any one of you suggest me with some cell phone Extender so that I can boost the signal level in my office? Also give me some tips for its installation as I do not know anything about its installation. If you have any idea about the shops from where I can get the cell phone Extender at the reasonable rates then please do share with me. or should I go for online shopping.