s wrote:

...
i am trying to establish where to solder an antenna.

Got 'cha ...

I don't think anyone here would hesitate to offer assistance. However,
for beginnings, the antenna should be cut for the specific freq of the
mouse. Do you know that freq?

And then, without a schematic of the mouse, how would someone locate the
"final amp" on the mouse with any certainty? Can you identify the
trace/other which is serving as the ant now? That is where, most
likely, you would make the connection. If it were my mouse I'd be more
brazen--you hating me for making a wrong "guess" just doesn't cut it!

There is more to worry about also ... trust me.

Crux of the matter being--no one is a big hurry to help you "burn up"
your mouse!

Regards,
JS