Indoor antenna advice

Hi I haven't done shortwave in a couple years and poped my current radio by hooking it up with an alligator clip I plan on pirate monitoring and am leaning towards a rs 505 clone considering there the cheapest iv seen some on close out as low as 45$ if I can find one if not want a pl 660 my question is if I get a long wire balun can I hook a long wire up safely or would splicing a mone patch wire with the negative lead grounded well please help and keep in mind I don't have a lot of money