I have been using the Wimo antenna and pre-amp since I bought my RadarBox and have been very pleased with the results. I did have a pre-amp failure, though and more recently found water had got into the antenna somehow (a rare occurrence, Wimo assure me). In both cases, the support from Wimo has been excellent, so I'd still recommend their gear, and await a replacement aerial. I have also visited another option for a standby antenna, and ordered a BS1100 (with AS high-gain whip option) from Martin Lynch. So it's belt and braces for me. I'm used to a 250 mile coverage with an external antenna, so they are well worth the investment - I don't want to be without one for any longer than I can help!
DC