Hope is a sad thing walkthrough - Infiltrating the ctOS tower - Watch Dogs

Infiltrate the ctOS tower

To gain access inside the antenna complex first take control of the camera on the satellite dish on your left when you are facing the entry door. Point the camera at the antenna in the middle of the compound and there should be an activation button reading "Antenna". Activate it and the dish will move on the left and an Unlock button will come in sight at the roof of the building to the left. After you unlock it activate the antenna once again and move the camera this time to the right and look on the ground level for a unlock button for the main gate. This will give you access to the complex.

In Plain Sight walkthrough - How to escape the Police chase in Watch Dogs

In Plain Sight - Preparation
Make sure to stock up on Jam coms before you start the mission. You may need more than 5 jams and if so you can craft them by learning the Jam coms ability from the Hacking skill tree. At the start of the mission open up your map and tag a harbor that is near. After that look for a fast car but dont stand around in one place for too long because civilians will recognize you and call the cops.

How to improve Watch Dogs performance and fps

Watch Dogs has been finally released by Ubisoft but sadly its unoptimized for PC consumers. Reports are rampant of massive frame rate drops and pesky stuttering even on high end machines.

To increase the frame rate and performance overall of the game you need to simply press alt+enter while in the game. This will make the game go into "windowed" mode which will drastically increase the fps.
After you engage windowed mode a title bar should appear at the top like in the screenshot above. There is not much cropped from the game to make room for the title bar and its a small price to pay for smoother gameplay.