I'm looking for helicopters that spawn around the city. I've bought the Vespucci Helipad, but I've only seen a helicopter land there on two occasions. Any other time I've shown up there, the place was empty. I have not been buying them from websites, since the first two times I visited the same black Maverick landed there. Surely I don't lose helicopters for destroying them, right? They're too easy to destroy and they cost too much to replace.
I've also been checking the rooftop of the hospital in Davis/Innocence Blvd. Out of around ten times I've checked, I've only been able to steal a helicopter from there twice.
If anyone knows any other locations where I'm certain to find a helicopter with little effort, please share them with me. They seem really rare due to their extremely low spawn rate. I'm a little tired of driving from helipad to helipad and finding nothing.
Edit: I caved and bought myself a chopper for the helipad. It took a little time after the purchase for it to be delivered. Just have to wait for the text that tells you it's been delivered. It's usually there at all times of day, where as the other Maverick only appeared past 7am-9pm or so. Generally only during the daytime. Still not certain on the spawn period for the hospital chopper.