Peter,
A selector switch such as will do the job.
It uses N type connectors. and has low loss, even up to 3GHz (3000MHz).
There may be some other types available with SMA connectors, but I use the type in the link for antenna changeover.
There are cheaper types, but most don't cover the higher frequency bands above 1MHz or if they do, often at considerable loss.
That type doesn't require power.
There are several coaxial relay-type antenna switches also available, which require power to change contacts, but for your purpose, a simple mechanical switch would be fine.
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