Sky Dew airship, Military observation balloon in northern Israel

Sky Dew is a large white tethered aerostat: an elongated balloon with a rounded nose, a tapered tail and a tall vertical fin, marked "TCOM" near the rear. A radar developed by Elta sits in a pod beneath the balloon, which is anchored by cables to a ground facility and a lattice tower in northern Israel.

Sky Dew was developed jointly by Israel's IMDO and the US Missile Defense Agency, with the aerostat built by the American company TCOM and the radar by Elta. It was unveiled with the start of deployment in November 2021, and on 23 March 2022 it was handed over to the Israeli Air Force in a ceremony attended by Major General Amikam Norkin and Admiral John Hill. In 2023 it joined Detection Battalion 503; after storm damage and a Hezbollah drone strike on 15 May 2024, the unit was reported closed on 2 November 2025.

The name Tal Shamayim means "Sky Dew" in Hebrew, and the English name Sky Dew is a direct translation. The aerostat's envelope was built by the American firm TCOM, whose name appears in small dark letters near the tail, while the radar payload came from Israel's Elta. The system was handed to the Israeli Air Force in a ceremony on 23 March 2022 attended by its commander, Major General Amikam Norkin, and by Admiral John Hill of the US Missile Defense Agency.

The aerostat is a military installation at a dedicated site in northern Israel, so there is no visitor access and photography of the site may be restricted. It is best seen from a distance, and its presence in the sky depends on whether the balloon is airborne or grounded for repairs, as happened after storm damage in 2023 and the Hezbollah strike in May 2024.

The High Availability Aerostat System incorporates both Israeli and American military technologies, resulting from collaboration between defense organizations of both nations.