**General Radio Topics**

[ARRL](http://www.arrl.org) [AMSAT](http://www.amsat.org)

**Local Clubs**

[Montgomery County ARC](http://www.marcclub.org/)
[AMRAD](http://amrad.org/) [Vienna Wireless
Society](http://www.viennawireless.org/home.php)

**Local Retail Stores**

[The RF Connection](https://www.therfc.com/)

**Mesh Networking**

[HacDC Byzantium Project](http://project-byzantium.org/) [Local
Broadband Mesh Activity](http://www.remoteamateur.com/)

**RTL-SDR (DVB-T USB dongle based SDR)**

[RTL-SDR resource](http://sdr.osmocom.org/trac/wiki/rtl-sdr) [RTL-SDR
resource](http://rtlsdr.org/) [Why buy a ham it
up?](http://www.rtl-sdr.com/rtl-sdr-direct-sampling-mode/)