Penguin NES Clone Help With Wireless Controllers

I have a couple of questions about a NES clone but I don't know if my post is in the correct area but here goes.

I have a NES clone that I got not too long ago, pretty cheap too (it's a penguin with a slot in the back 2 wireless controllers and 1 gun that plugs in the console) I like it and like the wireless controllers but I don't like the fact that they have to be pointed directly at the console in order for them to work. If I move a bit, the connection is lost and then I have to hurry up and point the controller straight again.

The other thing, there's a small buzz I keep hearing when I turn it on, is there any way to get rid of the buzz?
Also, is there a way to fix the line of sight issue with the controllers? Something like a tv remote range extender but something that would work with these controllers?

There's 2 slots in the Penguin console, but only the gun can be plugged in. The gun plug has a similar shape of the sega genesis 2 (only sega console I have to compare).

Also, being that it's a clone, I assume it will only play the 60 pin cartridges? The box doesn't say much other than it's compatible with 8 bit games (I figure due to copyright issues).