The antennae for the T2 is based on radio antennaes or 50 ohm cabling (which is the thin stuff you are referring to). You should probably only use this type for a simple extension. For longer runs you could use the shielded 52 ohm type (which is really thick). Both can be purchased someplace like radio shack.

The antennaes I used had amplifiers and used 75 ohm RG6 cabling, so I used this for the long runs. I would not use this as a standard replacment as it has too much resistance and it will likely cause signal loss.

Best, Cliff