Long range data transport

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hello guys

i read max distances on different data communications.

my project magnetometer on antenna tower indicating azimuth direction. more hmc5883 board.
the hmc 30 meter house, need see value.
i read i2c prrotocol can't handle distance. moving whole arduino outside, method can't connect small lcd display in house.

what reccomand?

i thought buying 2 arduino boards, putting 1 of them @ tower , other 1 in house , connecting them cat5 cable serial connection.

do have other cheaper / safer ideas?

thanks

my first attempt involve 30m of cable , slow i2c implementation, maybe few hundred bits per second.


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