Key to the Tower

 is a Quest in Escape from Tarkov.

Dialogue
"I have good news and bad news, which one should I start with? I'll start with the good news! We've proved our potential. Lightkeeper is pleased with us, and wants to meet you in person... Yes, you specifically. The bad news is you can't get to him that easily, the place is rigged with land mines. Plus, a sniper shoots everyone who comes near the lighthouse. We must somehow let them know that it's you, among all the other PMCs that are sniffing around there. So we'll put together a transponder for you. He will pick up the signal, give a sign to the sniper, and disable the mines. The path will be safe. I've already written down what materials I need to assemble it. Finding the the transmitter box won't be easy, but I think you could try looking somewhere where the USECs settled down."

Requirements

 * Must be level ? to start this quest.

Objectives

 * Hand over the 2 found in raid Pieces of plexiglass
 * Hand over the found in raid Insulating tape
 * Hand over the 2 found in raid Military circuit boards
 * Hand over the found in raid Military COFDM Wireless Signal Transmitter
 * Hand over the found in raid Working LCD
 * Obtain the Radio transmitter body on Lighthouse
 * Hand over the Radio transmitter body

Rewards
"Alright, we have everything we need, that's good."
 * +30,500 EXP
 * Mechanic Rep +0.01

Guide
There are multiple spawns for the radio transmitter body on Lighthouse. It seems to appear in different locations at the water treatment plant, at both chalets and in the sunken building at the shore.

First spawn
At the top of the southern tower at the water treatmant plant. 

Second spawn
At the blue chalet, on top of the fireplace. 

Third spawn
At the blue chalet, on the first floor in a package near the long tables. 