From ProPublica:

“We parked a 17-foot motor boat in a lagoon about 800 feet from the back lawn of The Mar-a-Lago Club in Palm Beach and pointed a 2-foot wireless antenna… Within a minute, we spotted three weakly encrypted Wi-Fi networks. We could have hacked them in less than five minutes…

“… we drove through the grounds of the Trump National Golf Club in Bedminster, New Jersey, with the same antenna and aimed it at the clubhouse. We identified two open Wi-Fi networks that anyone could join without a password. We resisted the temptation.

‘Those networks all have to be crawling with foreign intruders, not just ProPublica,’ said Dave Aitel, chief executive officer of Immunity, Inc., a digital security company, when we told him what we found.”

For the full story: https://www.propublica.org/article/any-half-decent-hacker-could-break-into-mar-a-lago