As a test, no worries. If there is any threat of rain, seal the connection.
You can find Coax-Seal at Amazon and other sources. Scotch 2228 sealing tape is at my local Home Depot.
http://www.homedepot.com/buy/electri...pe-124472.html
Both are permanent, and need to be cut away to access the connection in the future.
I would consider buying a new 100' RG-6 cable with factory installed connectors. Who knows, your trouble may be that you've got water in the existing coax.