More Than One Transformer per Antenna?

[audiobreadman]

I'm in the process of installing a TV Antenna in our attic. In the next few months, we'll be blowing in ~18" of insulation so we won't have much access to the attic after that. I'm thinking about installing two transformers and running two coax lines to the antenna. Only one coax line will be in use at a time, so I want to use the other coax as a back up in case one transformer bites the dust. Can I even do this (or would having two transformers effect the impedance)? Also, how reliable are these transformers--maybe I'm just adding extra work/cost? I searched for this online and I can't find a single person that mentioned this question.

For clarification, here's the transformer I'm referencing:
http://smile.amazon.com/gp/product/B0029U2XH2/ref=smi_www_rco2_go_smi_1968490042?ie=UTF8&psc=1&redirect=true&pf_rd_p=1968490042&pf_rd_s=smile-campaign&pf_rd_t=201&pf_rd_i=B0029U2XH2&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=09NR62PAYXGRPMT9WBX2

[ADTech]

Do NOT parallel two transformers, it will adversely affect reception.

[GroundUrMast]

Agreeing with ADTech, use only one matching transformer. You're correct, two or more transformers will cause impedance match problems.

In an attic, the antenna, transformer and coax should last indefinitely.

If you need to connect more than one tuner, use a splitter with the necessary number of output ports. The splitter is designed to maintain correct impedance matching in the system.

[audiobreadman]

I appreciate the quick replies--one transformer it is! And of course I'll check to make sure it isn't defective before blowing the insulation. Thank you!