Thumper by Kevin McConnell
ByKevin McConnell highly recommends using a thumper for white/hybrid/striped bass. See https://www.youtube.com/
He built his own a couple of years ago. There are ones for sale online or he has a list of the parts to order if you’re interested in making your own. Here is a shot of his Garmin Livescope after his thumper had run for about 10 minutes – https://photos.app.goo.gl/