I'd stick with separates. No combo antenna can match the performance of the Antennacraft 70 for deep fringe FM reception. (especially if you do
this simple modification)
I personally don't like using TV antenna systems for FM, especially if amplification is employed.
I NEVER recommend amplifying FM as it can likely add noticeable noise to distant FM stereo broadcasts. (and you just don't need it with such low line loss)