I am not familiar with the circular type antenna you are talking about. Is t a passive antenna, or does it have a amplifier like a Sensar does?? Is there a power supply for it?? The only thing I can think of is try connecting direct from the tv to the antenna. If you have stations fairly close, you should get something, even though it may be weak. The sensars will rk on strone signals even without the booster on. Actually most TVs will work with just a set of rabbit ears for local stations. If you get anything at all, then start tracing from there.