FM Tuner Antenna - what works best?

Can anyone recommend an affordable FM tuner antenna that gives exceptional results? I live in an apartment so hooking up a power antenna on the roof or outside the window is not an option. I will be using it with a Linn Kudos Tuner that, in most cases, gets excellent reception even with a basic plastic 'T' strip, but for some reason my most recent move has rendered this set-up inadequate (maybe a hill in the way of CBC's broadcasting towers?). My knowledge of FM antennas is limited and I am not sure whether a passive or power antenna is most suitable. Any input is appreciated. Thanks.