I only saw one that Dave Palmer from RTI brought to a dealer training session I attended. It looked like it may be a few inches longer than the one that came with the IRF-6 originally. Other than that really not much different. Mitch at RTI claims about a 30 foot increase in reception. I have a problem case in Orlando and will be trying these out on as soon as they come in. I will report back on the results and let everyone know how it performs in real life.
RTI also gave me a ton of their standard T2 system brochures, so if any body is interested in one, e-mail me with address and I would be happy to send one out.
Bill
www.homeautomationnet.com