I have a signal amp from GRE that sits on top of my BC780. 4 scanners are coupled to it and it works like a dream. This particular unit seems to be out of production but they still offer a unit intended for hand-helds, no reason why you can't use it on a base radio. Go to:
There is a base unit available from a different manufacturer:
It's been voiced on this forum that these devices do more harm than good to your listening and that you are wasting your money by buying one. I don't buy that at all. I live in northeastern NJ, about 40 miles outside of NYC and before I got that amp all I could hear was my local pd/fd, maybe one or two surrounding towns, and nothing beyond about a 10-15 mile radius. And that was with an omni-directional scanner antenna mounted on a 15-foot mast on top of my house. Using the back-of-set antenna was only marginally better. I was told by the salesman who sold me the amp that I was wasting my money, several of my 'radio buff' friends said I was wasting my money, but, lo and behold, after hooking it up I now hear most everything in the northern half of the state. I also hear a good portion of southern NY. Still using the same roof-mounted antenna as before.
Don't get me wrong, they don't always do this good. A buddy of mine bought one and it made almost no difference. His reception was marginal to begin with, the amp only slightly helped.
Well, now that I've rambled on forever, let me say that I hope the amp works for you the way it has worked for me.
Long Live The EL