ARRLCAD is an an e-mail reflector (mailing list) through which you can share your questions, answers, ideas and views about ARRL Radio Designer and other Amateur-Radio-related circuit and antenna design and simulation tools with other users, thanks to support and facilities provided by the Tucson Amateur Packet Radio Corporation (TAPR). To subscribe to ARRLCAD, send an email message to listserv@tapr.org with text that reads subscribe arrlcad FirstName LastName in which FirstName and LastName mean exactly that. If your name is Joe Smith, you'd subscribe with subscribe arrlcad Joe Smith The reflector software will confirm your subscription with a informational welcome message. Subscribing to and participating in ARRLCAD cost nothing at all. .