It is possible,... There is a GNU/Linux distro that has all the software needed. "DragonOS" For all you (Wireless) networking endeavors...
But over here at The other side of the pond... "transmitting" radiowaves is "Regulated" with a "Permit"/ham-radio license... and the spectrum already is "Distributed" between operators.
however.. i am not saying one cannot have fun?! Spending an afternoon sticking together a broomstick and an usbstick trying to contact major tom because that is literally what you will be doing.
get a conductive piece of "material" Plug into usb and try to let it radiate electromagnetic waves...
have fun and stay safe <3