I am in the process of building an off road trailer to pull behind my jeep. It will be used for camping trips to Big Bend and similar places. I am wanting to build an extendable pole that i can place a dual band antenna on top of to increase range from the trailer. I have read else where that you can use a Larson NMO 2/70 as its a 1/2 wave and will not need a ground plane. I don't see how this will work. I contacted larson about this exact same issue and they recommended a 48" diameter steel plate at the top of the mast for a ground plane. What are my options to mount a good dual band antenna around 12'-16' off the ground with an extendable pole while attached to a trailer. The trailer itself is not an enclosed trailer, its a cargo trailer that holds our camping gear, coolers, chairs, etc. There is no metal roof that i can attach an NMO directly to. Would someone be able to point me in the right direction of what antenna i need to buy, or build to get this to work correctly? I don't yet own an SWR meter as I'm not yet a HAM. I have listened for many year and truly enjoy it. I was intimidated to get on the air, but recently i have been studying and I'm planning on taking the next test in my area which is in just a few weeks! I know this may be a very easy or basic question for some to answer, and i want to thank you in advance for still taking the time to help us new folks out.