You might want to consder the DCI line of filters www.dci.ca Their 2m/70cm duplexer is reviewed in QST for December 2004.Out of band rejection in the ARRL lab was 60 dB and that may have been equipment limitations. They make two 2m filters. one is for the NA market 144-148MHz. The other is for the EU market where the band is only 144-146 MHz. Jack/KB4XF