*PLUMBERSSTOCK EXPERT* responded:
Hello! Thank you for inquiring about our Milwaukee 42-09-1020 antenna. Unfortunately, this antenna won't work for the Milwaukee 2790-20. The Milwaukee 42-09-1020 is intended for the Milwaukee 2590-20 12 volt radio. The antenna that would work for the Milwaukee 2790-20 is the Milwaukee 42-09-0290. Please check this Parts List for reference. If you want to purchase the Milwaukee 42-09-0290, just go to its product page, click the "Add to Cart" button, enter your zip code and you'll be all set. Thank you for visiting PlumbersStock.com. Happy shopping!