wow 400 mts is quite close by. Its almost next to your house. Hence the low dBm. But still speeds surprise me because even at the BSNL office I have managed to get speeds of around 225 KB/s in download. Anyway will check with someone as to why speeds are lower in our area. I get a dBm of around -60 to -65. The tower I guess is around 5-6 km away from my house.