Wireless with an extention cord you ask??? Yes. I played an outdoor gig this past weekend with just my Alesis DM PRO. I keep a 45' midi cable attached to it for times when I don't use the wireless, but in this case I did.
The story goes something like this...
It was a large park (Baker park in Frederick, Md. for those who know). We were set-up in a large gazebowith the main speakers pointing out on the park. I originally had the wireless MIDI receiver withthe DM PRO at the rack. I could get about 50' or so from the gazebo and still do ok. It worked but my curiousity had not been satisfied yet. I ran the receiver to the front of the gazebo, attached it to the rail, and then went back out into the park. BIG DIFFERENCE in performance!!
As the propellor on my head spins a little faster, the two-way radio guy in me is coming out a little. One thing to remember though the MIDI JET Pro has a 500' range, you can't forget the whole "line of sight" thing. The frequency range on the MIDI JET Pro is in the 2 GHz (gigshertz) range so though higher frequencies do penetrate walls, etc. Try and maintin a "line of sight" with your reciever as much as possible. Basically if you can see your rig, your wireless will work.
Another note for users of in ear monitors, keep your ears in. You will have better tracking if you keep the ears in, sometimes there is a delay out in the house and that can throw you off sync with who ever your playing with. If you not using ears, just stay close. it is still cool to wander about
Take care and stay safe, Mark