Instruction: Answer the given question using the supporting document.

Input:
Question: Does this include the GXM 30 combination antenna?
Document: I had been searching the various GPS manufacturers for awhile before settling on the 2730. I recently took a motorcycle trip to Wyoming from NY and had this GPS mounted on the handlebars. Very well made unit that made my trip much more enjoyable. I purchased this particular unit over others by TomTom and Garmin because I liked the XM weather/traffic/radio combination more than the bluetooth capability of the 'rider' and the 2820 (although the 2820 offers XM also, it does not supply the antenna as the 2730 does).
The GXM antenna for the XM radio/traffic information has a relatively short wire and it needs a clear line of sight to the sky. So, if you're riding with a passenger, and put the antenna on the roof (antenna has magnetic bottom) through the passenger window, it's going to be right in the passenger's face. There's an extension available, but it's confounding why they wouldn't give you an extra 2-3 feet on the wire for starters.
The first time I called Garmin they took several days to get back to me. The next time I got them after being on hold about 30 minutes. E-mail seems useless. I'm not impressed with their support, but still ended up with another Garmin. When you do finally get through, they are quite helpful.
(Note: as of 2007, price is about half! )ADDENDUM from Trips 2 and 3 (commuting to and from work):The routing software chose the fastest, most direct route, using a combination of highway and back roads -- impressive and efficient. The map accuracy is very good, except for a few quirks like calling a company campus entrance road an "alley. "Mounting on the dashboard is good for a heads-up navigation display.
The 2730 does not require an external antenna for the GPS portion, the XM receiver is only for traffic/weather/XM.
It's March 2009 and the unit still works great. Take care of the antenna, it costs a fortune to replace it!
Good combination of thurough map coverage and XM radio to boot. Audible of street names is handy and humorous at times given local pronunciations! The first trip with the unit, it took us to the corporate offices for the amusement park we were to visit - the park is not in the database (we ran into a Garmin employee on that trip who submitted a database input/change and prompted me on how to do it in the future).Every vehicle should get a GPS.
I saw this unit on Garmin's website a few months ago when I was looking at GPS units, and was attracted by the combination of XM and the Nav system. Buying these two features in one package makes this unit a pretty good value, even though this is a little pricey for a GPS unit. I bought it a few weeks ago and have been pleased since day one.It worked right out of the box, with no hiccups.
This GPS is great. I am a Realtor and use it every day. I especially like the feature that broadcasts the directions through my car radio. It is crystal clear and my clients enjoy it.Also, I really like the traffic and weather feature. It has saved me many hours of waiting in Houston traffic jams.I highly recommend the 2730 GPS unit. It is far superior to the TOMTOM I had for less than 30 days.Don
Therefore, I experimented by placing the antenna on the dashboard against the windshield and found that it works perfectly. One reason may be that my car has a sunroof that allows radio waves to enter. I recommend use of nail polish remover to erase trademarks so that unit does not attract attention of thieves.All-in-all, the GARMIN StreetPilot 2730 is a very capable unit that I am pleased to recommend.
Answer: When I bought the refurb years ago, it came with some kind of external antenna but not sure if it is GXM 30 combo.  As I remember, it was for subscription radio & maybe wx & traffic for detouring.  I do not use mine.