I owned an Austin Condor many years ago, paid a rather princely sum for it (like $42 or something a decade ago) and was disappointed in the performance from the minute I hooked it to my BC246T - was very weak on 800 MHz compared to the RS 800 at that time, weak on VHF and UHF reception compared to the Diamond RHC77A, and generally I have to say I was extremely disappointed in it overall considering the price I'd paid for it.
Overall in my own experience, the Diamond RHC77A is still the best "wideband" reception antenna I've ever used (since I've never had any interest whatsoever in transmitting) aside from a plain old telescopic whip that I could manually tune to the given frequency bands when needed. The RS 800 MHz is remarkably useful at VHF and UHF frequencies too, just not nearly as much as the RHC77A is given it's design.
If you're serious about monitoring, however, one antenna will never suffice, you'll have to acquire a few different ones.
Just my $.02...