Booster for 5130?

[MobileDoc]

Hi,

I have the problem that I live in an area with quite a poor network coverage, and I only get a weak signal when I hold the mobile out of the window. So I purchased an aerial (+3 db 1800 Mhz)and hoped this would improve, but with the aerial attached I don't get any signal. (However I do get a signal with the aerial in other parts of the house, the connection (speech quality) is even better, but the signal is "weaker" - about 1-2 bars less.)

So I thought about getting a signal amplifier to enhance the incoming signal (like a TV-booster) and amplify the outgoing signal. I have heard of these boosters on quite a lot of websites, but I couldn't find a shop that actually sold one.

Does anyone know where to get one, however, it should not be more expensive than £60. (I wouldn't be too unhappy to build my own either, if anyone had plans..)

Thanks,

Julian

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Mobile Doc