Best antenna for VHF contact

I currently use a dual band "tactical" j-pole antenna and have had several unsuccessful attempts at making contact with ISS. I am on a TYT TH-7800 using 50 watts. I have the downlink (145.800) and uplink (144.490) frequencies programmed into my radio. The antenna is not very high in the air right now and there are trees around. What could I do differently to have a better chance of success in contacting the ISS?

K5DWG – Wed, 2018 – 06 – 13 06:56
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