I always used an AR88LF on 136, but tapped the IF and fed it into
another receiver with better filtering. I too found the IF skirt selectivity
of the AR88 inadequate, however using it as a tunable converter
worked very well with either a Racal RA17, or with a Ricebox which
was deaf lower down the scale. The major downside consisted of
weight and size!

73  Howard Aspinall G3RXH