Yep, I'm using the coiled chord that came with it. It reaches. Don't know where the plug is on a 2007, though.
If you want, there is also this option.
http://www.invisicord.com/index.html
Basically, it plugs into the back of the autodim mirror on the Expeditions. Don't know if it will work with an 07.
There are also extension chords for a 12V power point, sold at many auto stores. Also, they sell bare wire 12V plugs, that plug into the 12V power point, and have the two bare wires there, so you can hook up whatever you want (in this case, a possible hardwire kit.) That way, you wouldn't even have to open up your fuse box.
Also, just in case you're wondering, here is a list of reported radar band usage in various towns in Texas. (Got it from the rd.net forum)
Basically, they say unless you travel through south Texas, you might as well turn off X band. Also, I'd prolly turn off POP (if it isn't already off) it isn't used much. Even if it was, cheap detectors will set it off more than a real threat.
Hope this helps
Texas (thanks xihua, wkopplin, f_399, ryansandlin, hookem202, StlouisX50, magamaga, duality, erikonphoenix)
Austin: K,Ka,laser
Beaumont: K, Ka, Laser
Blanco County: K
Burnet County: *X*, K
Centerville: Ka (unconfirmed)
Chambers County: K, Ka
Clear Lake Shores: K
Comal County: K
Dallas/Fort Worth: K, Ka, Laser, Pacing
El Lago: K
Galveston County: K, Ka, Laser
Garden Ridge: Ka
Harris County: K, Ka, Laser
Hill Country Village (San Antonio): K
Horseshoe Bay (Burnet County): K
Houston HPD: K, Laser (PL3), possible POP
Huntsville, Texas Ka,K,Laser
Irving/Dallas, Texas: K, Ka, Laser, POP
Jefferson County Sheriff: K, Ka
Johnson City: K
Kemah: K
Lakeview: K
LaPorte: K
League City: K
Marble Falls Police (Burnet County): K
McLennan County: K, Ka
New Braunfels: K, Ka
Pasadena: K
San Antonio: K, Ka
Seabrook: K
Shenandoah: Laser
Texas DPS: Ka, Laser
Universal City: K
Waco: K, Ka, laser
Webster: K, Ka, Laser (PL3)