Since you are not using a preamp, the FM filter, or two in series, can be inside. If you were using a preamp, it would go between the antenna and the input of the preamp.
If you order a custom filter to make real channel 41 (virtual channel 57.1) weaker, you must order a single channel
bandstop filter for its real RF channel 41.
http://www.tinlee.com/MATV-Bandstops.php?active=3