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Your place of employment might have a lot of concrete wih rebar. If you set up the antenna indoors, the rebar acts like a Faraday Cage, preventing the signal from getting out (or in, for that matter).
What you want to do is set it up as close to outside as possible, wherever you mount it. If you use a ducted fan cooler you might be able to leave it in the attic, near the vents.
Outdoors may mean mounting the unit outdoors too. There are TIS systems which use the TH in a weatherproof box, on a substantial pole, such as a phone pole. You coud find a similar box and put it outside on the end of your house eave, along with the external ATU system, or lay out the wire in a place it will work best. Could even attach it to a PVC pipe with zip ties and nylon guys to stabilize it.
If you look back in the archives, maybe yu can find the post I did on putting it in an arch window inside, got our more than 800′ in some directions.
Also, if you can get a good ground, or ground proximity for counterpoise, it will help.
Using the wire antenna, I believe the TH will work best at 1610 kHz if you can, but that is usuallly a fairly busy frequency in many areas. Check the FCC site for researching open freqs in your area.