I'm certain it is much smaller. The F-117's Xsection has been compared to a bumblebee.
Here are some RCS figures for some aircraft and a couple of missiles. Note that the first number is the RCS in dBsm, and the second figure the RCS in meters squared. Enjoy.
.........//RCS (dBsm) // RCS (m2)
F-15 Eagle // +12 // 15
F-4 Phantom II //+20 // 100
B-52 Stratofortress //+20 // 100
Su-27 //+12 // 15
B-1A //+10 // 10
F-16 Fighting Falcon //+7 // 5
B-1B Lancer //0 // 1
F-18E/F Super Hornet // 0 // 1
Rafale //0 // 1
Typhoon //-3 // 0.5
AGM-86 ALCM //-6 // 0.25
BGM-109 Tomahawk //-13 // 0.05
SR-71 Blackbird //-18 // 0.015
F-22 Raptor //-22 // 0.0065
F-117 Nighthawk //-25 // 0.003
B-2 Spirit //-28 // 0.0015
AGM-129 ACM //-30 // 0.001
Boeing Bird of Prey //-70 // 0.0000001
And a better way to see just how 'tiny' the stealthier crafts are compare their RCS (meters squared) with the following chart. The stealthy craft basically have insect-level RCS'.
Anyways, here is the chart (note that craft like the Raptor are around the insect RCS range):