Mark - The natural impedance of a quarter wave dipole is 37 Ohms. The receivers are probably matched to this, or maybe 50Ohms. The mismatch between 37 and 50 Ohms isnt that bad and can be ignored for most purposes.
Trial and error is certainly the best way of finishing off the design, but it is important that basic design principles are followed to start with. Trial and error wont fix a basically bad design, but it can improve a good one!
Jonas - following on from that last comment, you may or may not have problems when you come to putting everything in the box. Its impossible to say at the moment. If it all works OK, then congratulations! If not, then dont say we didn;t warn you! Good luck.
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