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What sort of value condenser would you advise using to try and lower the range, and where would you try fitting it?
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It's difficult to say without seing the circuit, knowing what the value of the tuning capacitor is and knowing the present coverage.
To establish the present coverage you need to identify stations at the extreme ends of the scale and know their frequencies. It's nice to talk in metres, but using Khz makes calculations so much easier.
A suck it and see approach would be to connect a 50 pF capacitor (or whatever similar value you have) across the tuning capacitor and see how this changes the coverage. You can then increase or decrease the capacitor value as required.