i have a problem with my iPhone 3Gs wifi and Bluetooth* they work but poor signal* i have to be 0.5m near to the wifi rooter to detect it!!

any one solved similar problem? or Any idea?

i have changed the first filter* and no change. and cheked connection to antenna.

can the problem came from the second filter? how can i check it?

can i make an antenna directly from first filter?

i have attached shematic that i have

thank you in advance.