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Today, I put together a new portable repeater antenna setup together. I do a lot of work with Amateur Radio Emergency Service. Often, we need a repeater setup so our people can run around with HT's and still be able to communicate direct with everyone. The antenna is setup for 2m, 70cm and GMRS. In all services, the SWR is 1.2:1 or better. It's sitting on top of a fiberglass mast. The total height is 47 feet from the ground to the top of the antenna. The bottom of the antenna is 40' from the ground. My son Nick is next to it to use as a reference. I tested it out on 2m. Full quiet to another station 40 miles away, with only 5 watts. I'm pretty happy with that. On 70cm and GMRS, I was full quiet to a repeater 22 miles away with just 2 watts. I am pretty happy with this setup. I am going to be doing a training drill on March 28. We'll see how it goes. http://fiveguysracing.com/marc/HAM-GMRS/Pot_2m-440_Repeater_Antenna_2.jpg http://fiveguysracing.com/marc/HAM-GMRS/Pot_2m-440_Repeater_Antenna_3.jpg

Congrats!

Glad I could help. I had tried different things and was having trouble and when I plugged in our locations, the root problem became clear to me. Forums are my go to also

It appears the ID of the vertical mast hole is 1.8". So, it won't work with your 2" OD pipe. OTOH, you can get 48' of fiberglass mast (12 x 4') for around $90 that would work quite well with the base. Or, you could make a base section of the mast with a smaller sized pipe and an adapter to 2".

How about a DIY base using something like this http://ham-radio-antenna.net/photos/ANTENNA_RADIO_TOWER_ALUMINUM_ORANGE_TRIPOD_FOR_USE_WITH_MILITARY_48_MAST_POLE_02_gfo.jpg and some pipe or conduit. Take a look at this site or this site for a number of options.