Use any simple radio transmitter to send web pages and Audio/Video via the soundcard.
Rates up to 100kb/s possible. With two transmitters, 2way communication is possible allowing PPP TCP/IP over radio. In addition, you can send UDP packets and RS232 data. Uses quadrature amplitude modulation scheme (QAM). Robustness is done with Read Solomon coding, interleaving, and TCM. Source code written in Borland C++ Builder included.