I'd refuel my planes here. It's King Khalid Military City, most commonly referred to as KKMC. It's not too easy to see (click on picture to enlarge), but there is a nice airfield off to the upper right. Built by Vinnell Corp, and designed to land, re-arm and refuel F-15s. KKMC is in northern Saudi Arabia, and was designed to help protect the northern Saudi border from Iraq incursions. I've been there occasionally on a training missions. It's in the middle of friggin' nowhere, and the airfield is to the southwest of friggin' nowhere (the picture is inverted, north is to the bottom of the picture, add'l picture with a little more detail here).
If the Israelis were to disguise their airplanes, and fly in there sometime around 2000 hrs, then capture the airfield personnel, it would be several hours before anyone knew something was going on. Even with the Royal Saudi Land Forces barracks just down the road in the main part of KKMC, it would be several hours after that before the Royal Saudi forces could mount an attack. With only one easily defended road from KKMC to KKMC airfield, it wouldn't be that hard for the Israelis to beat off an attack. It would then be at least six or seven hours (and more likely 24 hours) after that before any sort of Saudi reserve ground force could be mustered from outside of KKMC and brought to bear. As with the airfield, there is only one road into KKMC proper (it's the road visible coming into KKMC from the left), and it wouldn't be too tough for a light battalion to control that high-speed avenue of approach for at least another several hours. All total, the Israelis would have anywhere from 12 to 24 hours to use a well stocked, well built airfield from which their F-15s would be able to be refueled, re-armed and launched to strike nearly anywhere in Iran. Israeli F-16s could fly CAPs over the airfield to deter any Royal Saudi Air Force response coming up from PSAB, and even if the RSAF did attack, their training is mostly in air-to-air combat, not air-to-dirt bombing in support of a ground attack. Add in a few SHORAD sites around the airfield, and the RSAF would likely not affect much of the fighting on the ground.
After using it for maybe a day, the Israelis could load up and quickly cross into Iraqi airspace and hotfoot it home at low level.
At least that's what I'd do if I were going to attack Iran.