I am using a Racer Pro 502 Desert Intercom from Racer imports I had a terraphone intercom but I found that if it was subjected to rain it played up. I think the Racer Pro 502 Desert Intercom is a bit more water proof - so far so good.
We had a terraphone in the rivvy, not worth the money spent. Had a few dramas with our Pro Racer one from Racer Imports in the new car - it would broadcast to the CB only very quietly. Called Cameron and explained and he told us how to turn up the gain. It didnt help it much so he asked for it back. Within a week he sent it back working perfectly. No more dramas.
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Green Sally up. Green Sally down. Lift and squat, gonna tear the ground.