Low Q and limited frequency range. They are great as a wideband delay, but the output signal is very low. Perfect for TV, where the noise on the colour signal would only present as slight colour shift, not as brightness variations.
For an oscillator use a SAW filter, as they are optimised for frequency response, and have a very short delay and very poor response outside of the band they are designed for. In TV sets pre digital tuners you would have one with 2 outputs, centred on 39 MHz, with one being optimised to give the video signal to the demodulator without having the sound carriers present and the other output just passing the sound carriers without the video being present. This got rid of both sound on vision and video buzz at the same time, AFC being used to give the maximum signal out of the video side before the FM demodulator made the baseband video, and the sound was mixed down to a typically 4, 4.5, 5, 5.5, 6, 6.5 MHz ceramic filter ( system dependant) before it was demodulated into 1, 2 stereo or a NICAM audio signal. Started off as a big piece of printed board but ended up as a single chip that did it all except for NICAM, which was still a multi chip arrangement.