WiFi Booster, the Cydia application with which we can increase the signal captured by the WiFi of our iPhone and also add the effect "Drag to Update" in the settings and distance indicator, It has been done compatible with iOS 5.
This application improve the list of Wi-Fi networks to display all networks in range using the elimination of the signal level limit.
The network list item has also been Enhanced to display the BSSID (address MAC AP) and RSSI (signal level) for each network.
You can download it by 1,99$ in Cydia.
You will find it in the BigBoss repo.
You need to have done the jailbreak.