NOT SURE IF IT IS 5 OR 3.5 DB GAIN. IT WAS A BIG IMPROVEMENT OVER THE 1/4 WAVE. MAST ONLY, SCREWS ON TO MAG MOUNT OR THROUGH ROOF CONNECTOR. WE HAVE MAGNET MOUNTS IN A SEPARATE AUCTION AND WILL COMBINE SHIPPING. PLEASE LOOK AT PICTURES FOR DETAILS AND CONDITION. ASK ALL QUESTIONS PRIOR TO BIDDING. Everything we list is from our own stock. One owner, dry, smoke pet free; well cared for. Check our related items. We have many items and will combine shipping. If you need something you don't see, please contact us with your needs. We ship FAST and reasonably.All sales final, no returns. Payment must be received in 24 HOURS. PLEASE Leave Positive feedback and we'll do the same IMMEDIATELY AFTER RECEIVING FEEDBACK. PLEASE CONTACT US IF THERE'S A PROBLEM, WE WILL RESOLVE ISSUES. USA shipping to a confirmed address Only. ZERO FEEDBACK BIDDERS MUST CONTACT US OR THE BID WILL BE CANCELED. MOST ITEMS ARE FOR SALE LOCALLY AND WE RESERVE THE RIGHT TO END AUCTIONS WITH NO BIDS. PLEASE GET YOUR BID IN EARLY. Thanks for looking!! Powered by Turbo Lister The free listing tool. List your items fast and easy and manage your active items. Check all our shipping options for the least expensive method. Feel free to make an offer , the worst that can happen is a counter offer! B1 on rack in box Add to cart for shipping quote on multiple quantities. US Seller! Very fast shipping!!