I couldn't find the specs either for the Cabletronix FMTVS. It isn't a HLSJ or FM trap/filter, but a TV/FM separator. It might be possible to use the TV section as an FM filter, but I would want to know the specs first. I seem to remember that the FM rejection of the TV section isn't quite as good as an FM filter or HLSJ.
ADTech has measured HLSJs:
