JimmyH: I managed to get OK reception (in a fairly marginal area) using one of the "One-For-All" models. It was the amplified model with the square-ish loop UHF and pull-up VHF aerials, and 39db of gain - from memory it was about $80. I had previously tried a couple of cheaper ones, and another One-for-All model that looked like a black rectangle about an inch wide and a foot tall and had the option of powering off USB, and their performance wasn't nearly as good (*).
alasta: The rectangular shaped One for All model sounds like the one I bought a few months ago ... It's designed to stand upright but because I was pointing it at Kaukau (Wellington) which is horizontally polarised I laid it on its side.