This is base, with many helicopters:
Do not think that the missiles, being a russian product, have been sold to rebels by russian authorities. Indeed, this type of sophisticated and expensive weapons are thought to have been supplied to rebels by Saudi Arabia.
These are probably the anti-tank weapons that rebels (e.g. in an interview with Salim Idriss to the BBC) desperately called for recently, also during Qusayr siege.
Already seen utilized here, two weeks ago, in the district of Damascus, by rebel brigade named Liwa al-Islam:
This second location: