Computer Mice and Mousepads

Long story short, despite living in a detached home with not too much 2.4 GHz noise, my Logitech unifying receiver has trouble with my mouse at 20 centimeters from the receiver. Keyboard at roughly 7-8 centimeters range has less trouble, but not none.

I can't be arsed to get an USB extension cord or anything. This is a stupid-ass problem. I want to replace them with something new. What mouse would you suggest that's ergonomic, but not too expensive? I'd say 150€ is the absolute limit, but would prefer under 100€. Mouse should be wireless as I have a tendency of moving it around. It's just the Unifying Receiver tripping me up - I've not had much trouble with other wireless mice in the past, and the same mouse works completely fine on Bluetooth as far as range is concerned, but it's a pain to reconnect on Linux for some reason or another.

I do a little gaming, but mostly software engineering. Precision isn't as important as comfort. I also don't want to get something uber weird shaped, it should still look and feel like a mouse ideally.