I have a bell 24" dish and a very similar LNBF, that size dish almost picks up G19; borderline at best. It will take very precise fine tuning and a clear day. At sea level with all the moisture in the air it may not work... but if you do get it to work you will have had some good experience and will find setting up a larger dish a cakewalk.
I use the 24' dish as a birdbath now.
AzBox Ultra, 10' bud, ASC1, Corotor II and Norsats, WSI-9036 & HH120 / Avenger PLL321S-2
MicroHD, 90cm Geosat Pro, SG2100 & SP1PLL
+ various dishes, LNBs , switches, and receivers.